My issue is when i submit my form my outcome is unsucessfull.

PHP Code:
<?php

class model {

    function 
__construct($url$root$common_model$common_view$alt_root) {

        
$this->url $url;
        
$this->root $root;
        
$this->common_model $common_model;
        
$this->common_view $common_view;
        
$this->alt_root $alt_root;

        
$this->loader();

    }


    function 
loader() {

        if (
$this->common_model->search_get($this->url,'Log_An_Invoice')=='View_An_Invoice') {

            
$this->View_An_Invoice();
            
        } elseif (
$this->common_model->search_get($this->url,'Log_An_Invoice')=='Invoice_Logged') {

            
$this->Invoice_Logged();

        } else {
        
            
$this->Log_An_Invoice();
            
        }

    }


    function 
Log_An_Invoice() {

    
$this->common_view->template_header();
        
        
$this->common_view->cams_style();

        
$this->common_view->template_body();
        
        
$this->common_view->page_title('Log An Invoice''Log_An_Invoice');
        
        echo 
'<div class="tabPane">';
                
                echo 
'<div class="tabActive" onclick="window.location.href=\''.$this->root.'Log_An_Invoice\';"><span><b>Log An Invoice</b></span><img src="'.$this->root.'images/gui/tab_right_active.gif" /></div>';
        
        if ((
$_COOKIE['talent_user_email_address'] == "paul.jackson@talent.co.uk")){    
            echo 
'<div id="left_actions" class="tabInactive" onclick="window.location.href=\''.$this->root.'Log_An_Invoice/View_An_Invoice\';" onmouseover="document.getElementById(\'left_actions\').className=\'inactiveTabOver\';document.getElementById(\'right_actions\').src=\''.$this->root.'images/gui/tab_right_over.gif\';" onmouseout="document.getElementById(\'left_actions\').className=\'tabInactive\';document.getElementById(\'right_actions\').src=\''.$this->root.'images/gui/tab_right_inactive.gif\';"><span><b>View An Invoice</b></span><img id="right_actions" src="'.$this->root.'images/gui/tab_right_inactive.gif" /></div>';    
        } else {}
          
        echo 
'</div>';
        
        echo 
'
      <form class="form-signin" role="form" action="window.location.href=\''
.$this->root.'Log_An_Invoice/Invoice_Logged\';"method="POST">
        <h2 class="form-signin-heading" style="text-align: center;">Invoice Form</h2>
        <select name="InvoiceFrom" id="InvoiceFrom" type="Text" class="form-control" required autofocus>
            <option value="" selected>Please Select One...</option>
            <option value="Talent">Talent</option>
            <option value="Redwood">Redwood</option>
            <option value="Hillingdon">Hillingdon</option>
        </select>
        <input name="InvoiceTo" type="text" class="form-control" placeholder="Invoice To" required>
        <input name="ContactName" type="text" class="form-control" placeholder="Contact Name" required>
        <input name="ContactNumber" type="text" class="form-control" placeholder="Contact Number" required>
        <input name="Email" type="email" class="form-control" placeholder="Contact Email" required>
        <textarea name="InvoiceAddress" type="text" class="form-control" placeholder="Contact Address" rows="5" required></textarea>
        <input name="PoNo" type="text" class="form-control"  placeholder="PO No" required>
        <textarea name="Details" type="text" class="form-control" placeholder="Invoice Details (Description)" rows="5" required></textarea>
          
        <div class="input-group">
        <span class="input-group-addon">&pound;</span>
        <input name="InvoiceAmount" class="form-control" placeholder="Total Amount" type="number" required>
        </div>
          
        <label class="checkbox" >
          <input type="checkbox" value="0" style="text-align: center;" required> I accept that the following information is correct.
        </label>
        <button type="button" type="submit" >Log Invoice</button>
      </form>'
;
      
    
$this->common_view->template_footer();
    
    }


    function 
View_An_Invoice() {
        
        
    
$this->common_view->template_header();
        
        
$this->common_view->cams_style();

        
$this->common_view->template_body();
        
        
$this->common_view->page_title('View An Invoice''View_An_Invoice');
        
        echo 
'<div class="tabPane">';
        
        echo 
'<div id="left_actions" class="tabInactive" onclick="window.location.href=\''.$this->root.'Log_An_Invoice\';" onmouseover="document.getElementById(\'left_actions\').className=\'inactiveTabOver\';document.getElementById(\'right_actions\').src=\''.$this->root.'images/gui/tab_right_over.gif\';" onmouseout="document.getElementById(\'left_actions\').className=\'tabInactive\';document.getElementById(\'right_actions\').src=\''.$this->root.'images/gui/tab_right_inactive.gif\';"><span><b>Log An Invoice</b></span><img id="right_actions" src="'.$this->root.'images/gui/tab_right_inactive.gif" /></div>';    
    
        
        echo 
'<div class="tabActive" onclick="window.location.href=\''.$this->root.'Log_An_Invoice/View_An_Invoice\';"><span><b>View An Invoice</b></span><img src="'.$this->root.'images/gui/tab_right_active.gif" /></div>';
        
        echo 
'</div>';
    
        
// Make a MySQL Connection
        
mysql_connect("localhost""Form""") or die(mysql_error());
        
mysql_select_db("talent_intranet") or die(mysql_error());
    
        
// Get all the data from the "example" table
        
$result mysql_query("SELECT * FROM Form"
        or die(
mysql_error());  
    
        echo 
'<div style="margin-left:5px;margin-right:5px;" class="search_results_header" align="left">
              <table style="border-collapse:collapse;" cellpadding="2" cellspacing="0" border="0" width="100%">
                <tbody><tr>
                  <td colspan="7" class="td_header" height="30" width="100%"><b>Approvals</b><div style="float:right;">
                    <button type="button" href="www.talnet.co.uk/intranet/Log_An_Invoice">Log An Invoice</button><button type="button" href="www.talnet.co.uk/intranet/">Home</button> 
                    </div></td>
                </tr>
                <tr>
                  <td class="td_header" height="30" width="4%">ID</td>
                  <td class="td_header" height="30" width="6%">Invoice From</td>
                  <td class="td_header" height="30" width="15%">Invoice To</td>
                  <td class="td_header" height="30" width="7%">Invoice Address</td>
                  <td class="td_header" height="30" width="6%">Contact Name</td>
                  <td class="td_header" height="30" width="7%">Contact Number</td>    
                  <td class="td_header" height="30" width="22%">Email</td>
                  <td class="td_header" height="30" width="12%">Po No</td>
                  <td class="td_header" height="30" width="10%">Details</td>
                  <td class="td_header" height="30" width="10%">Invoice Amount</td>
                  <td class="td_header" height="30" width="10%">Date Submitted</td>
                  <td class="td_header" height="30" width="10%">Submitted By</td>
                </tr>
              </tbody></table>
              </div>
              <div style="padding-left:5px;padding-right:5px;padding-bottom:5px;" align="left">
              <div class="search_results" style="height:175px;overflow-y:auto;overflow-x:auto;" align="left">
              <table style="border-collapse:collapse;" cellpadding="2" cellspacing="0" width="100%">
                <tbody>'
;
        
// keeps getting the next row until there are no more to get
        
while($row mysql_fetch_array$result )) {
        
// Print out the contents of each row into a table
        
echo '<tr><td class="td_header" height="30" width="15%"><font size="1">'
        echo 
$row['id'];
        echo 
'</font></td><td class="td_header" height="30" width="15%"><font size="1">'
        echo 
$row['InvoiceFrom'];
        echo 
'</font></td><td class="td_header" height="30" width="15%"><font size="1">'
        echo 
$row['InvoiceTo'];
        echo 
'</font></td><td class="td_header" height="30" width="25%"><font size="1">'
        echo 
$row['InvoiceAddress'];
        echo 
'</font></td><td class="td_header" height="30" width="15%"><font size="1">'
        echo 
$row['ContactName'];
        echo 
'</font></td><td class="td_header" height="30" width="15%"><font size="1">'
        echo 
$row['ContactNumber'];
        echo 
'</font></td><td class="td_header" height="30" width="15%"><font size="1">'
        echo 
$row['Email'];
        echo 
'</font></td><td class="td_header" height="30" width="15%"><font size="1">'
        echo 
$row['PoNo'];
        echo 
'</font></td><td class="td_header" height="30" width="15%"><font size="1">'
        echo 
$row['Details'];
        echo 
'</font></td><td class="td_header" height="30" width="15%"><font size="1">&pound;'
        echo 
$row['InvoiceAmount'];
        echo 
'</font></td><td class="td_header" height="30" width="15%"><font size="1">'
        echo 
$row['Submitted'];
        echo 
'</font></td><td class="td_header" height="30" width="15%"><font size="1">'
        echo 
$row['SubmittedBy'];
        echo 
"</font></td></tr>";
        } 
    
        echo 
"</tbody></table></div></div>";
        
        
mysql_close();
        
        
$this->common_view->template_footer();
        }
        
    function 
Invoice_Logged() {

        
$this->common_view->template_header();
        
        
$this->common_view->cams_style();

        
$this->common_view->template_body();
        
        
$this->common_view->page_title('Invoice Logged''Invoice_Logged');
        
        echo 
'<div class="tabPane">';
        
        echo 
'<div id="left_actions" class="tabInactive" onclick="window.location.href=\''.$this->root.'Log_An_Invoice\';" onmouseover="document.getElementById(\'left_actions\').className=\'inactiveTabOver\';document.getElementById(\'right_actions\').src=\''.$this->root.'images/gui/tab_right_over.gif\';" onmouseout="document.getElementById(\'left_actions\').className=\'tabInactive\';document.getElementById(\'right_actions\').src=\''.$this->root.'images/gui/tab_right_inactive.gif\';"><span><b>Log An Invoice</b></span><img id="right_actions" src="'.$this->root.'images/gui/tab_right_inactive.gif" /></div>';
        
        if ((
$_COOKIE['talent_user_email_address'] == "paul.jackson@talent.co.uk")){    
            echo 
'<div id="left_actions" class="tabInactive" onclick="window.location.href=\''.$this->root.'Log_An_Invoice/View_An_Invoice\';" onmouseover="document.getElementById(\'left_actions\').className=\'inactiveTabOver\';document.getElementById(\'right_actions\').src=\''.$this->root.'images/gui/tab_right_over.gif\';" onmouseout="document.getElementById(\'left_actions\').className=\'tabInactive\';document.getElementById(\'right_actions\').src=\''.$this->root.'images/gui/tab_right_inactive.gif\';"><span><b>View An Invoice</b></span><img id="right_actions" src="'.$this->root.'images/gui/tab_right_inactive.gif" /></div>';    
        } else {}
        
        echo 
'<div class="tabActive" onclick="window.location.href=\''.$this->root.'Log_An_Invoice/Invoice_Logged\';"><span><b>Invoice Logged</b></span><img src="'.$this->root.'images/gui/tab_right_active.gif" /></div>';
          
        echo 
'</div>';
        
        
$Submitted date("d-m-Y");

        
$SubmittedBy $_COOKIE['talent_user_email_address'];

        
$errors = array();

        
$required = array(
            
'InvoiceFrom'   =>'This is required',
            
'InvoiceTo'     =>'This is required',
            
'InvoiceAddress'=>'This is required',
            
'ContactName'   =>'This is required',
            
'ContactNumber' =>'This is required',
            
'Email'         =>'This is required',
            
'PoNo'          =>'This is required',
            
'Details'       =>'This is required',
            
'InvoiceAmount' =>'This is required'
        
);
        
        if (
'POST' === $_SERVER['REQUEST_METHOD'])
        {
            foreach (
$required as $field => $error)
            {
                
$isEmpty == strlen(trim($_POST[$field]));
                
                if (
$isEmpty) {
                    
$errors[] = $error;
                }
            }
    
            if ( ! 
filter_var($_POST['Email'], FILTER_VALIDATE_EMAIL)) {
                
$errors[] = 'Email must be a valid email address';
            }
            
            if ( ! 
preg_match('~^[0-9.]+$~i'$_POST['InvoiceAmount'])) {
                
$errors[] = 'Invoice amount value is invalid';
            }
            
         
            if(!isset(
$_POST['InvoiceFrom'])){
                  
$errors[] = '<li>You forgot to select the company!</li>';
            }
         
            
            if (empty(
$errors))
            {
               
$con mysql_connect("localhost","Form","","talent_intranet");
               if(!
$con){
                die(
'Could not connect: ' .mysql_error());
               }
                
$db_selected mysql_select_db("talent_intranet"$con);

                if (!
$db_selected){
                    die (
"Can\'t select db : " mysql_error());
                    }
                
                
                
$sql sprintf(
                    
"INSERT INTO
                        Form
                    (InvoiceFrom, InvoiceTo, InvoiceAddress, ContactName, ContactNumber, Email, PoNo, Details, InvoiceAmount, Submitted, SubmittedBy )
                        VALUES
                    ('%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s','
$Submitted','$SubmittedBy');",
                    
mysql_real_escape_string($_POST['InvoiceFrom']),
                    
mysql_real_escape_string($_POST['InvoiceTo']),
                    
mysql_real_escape_string($_POST['InvoiceAddress']),
                    
mysql_real_escape_string($_POST['ContactName']),
                    
mysql_real_escape_string($_POST['ContactNumber']),
                    
mysql_real_escape_string($_POST['Email']),
                    
mysql_real_escape_string($_POST['PoNo']),
                    
mysql_real_escape_string($_POST['Details']),
                    
mysql_real_escape_string($_POST['InvoiceAmount'])
                );
                
$res mysql_query($sql$con);
                
                }
                
                if(!
$res){
                  die (
"Can\'t run query : " mysql_error());
                }
        
                
$errors[] = mysql_error($con);
        
                
mysql_close($con);
            echo
'<h1>Your Invoice Was Logged Successfully!</h1>';
            
            echo
'<button type="button" href="www.talnet.co.uk/intranet/Log_An_Invoice">Log An Invoice</button> <br> <button type="button" href="www.talnet.co.uk/intranet/">Home</button> ';

            } else {
        
            echo
'<h1>Your Invoice Was Not Successful!</h1>';
                
            echo
'<button type="button" onclick="window.location.href=\''.$this->root.'Log_An_Invoice\';">Retry</button> <br> <button type="button" onclick="window.location.href=\''.$this->root.'\';">Home</button> ';
        
            echo
'<h2>Please contact your system administrator. Inform of the following message.</h2>';
            
            if (
count($errors)){
                foreach (
$errors as $error){
                    echo 
$errors;
                }
            }
            
            
error_reporting(E_ALL);
            
            }
        
            
$this->common_view->template_footer();
                        
        } 
    }


?>
None of Invoice_Logged funtion is wrong. i dont understand how make a form post to a function that injects.

Help please.

Thanks
-Jamie