im having trouble validating my drop boxes... if someone doesn't select anything i want an error message to appear on the next page.
im able to notify the user if he hasn't written anything in the text box, how ever if i do write something im unable to pass the code over to the results page
can anyone help me out
heres my code


PHP Code:

<HTML>

<HEAD>
<TITLE>Anime Site Registration</TITLE>
</HEAD>

<BODY background="http://www.black-howling.com/images/wood1.gif">


<p align="center"><font size="14" color="black" face="serif">
Anime Form Sign Up</font></p>

<FORM METHOD="POST" ACTION="animeresults.php">


   
<BR><B>Name:</B>
<BR><INPUT TYPE="TEXT" NAME="username">
<BR>


<!-- radio button -->

<font size="5" color="black" face="serif">
<BR>Gender</font>
<BR><INPUT TYPE="RADIO" NAME="radiobutton"
   VALUE="Male">Male
<BR><INPUT TYPE="RADIO" NAME="radiobutton"
   VALUE="Female">Female
<BR>


<BR><B>Birthday</B>
<BR><INPUT TYPE="TEXT" NAME="birthday">
<BR>

<BR><B>Homeaddress</B>
<BR><INPUT TYPE="TEXT" NAME="homeaddress">
<BR>

<BR><B>City</B>
<BR><INPUT TYPE="TEXT" NAME="homecity">
<BR>

<BR><B>State</B>
<BR><INPUT TYPE="TEXT" NAME="homestate">
<BR>

<BR><B>Zip</B>
<BR><INPUT TYPE="TEXT" NAME="homezip">
<BR>



<!-- single select -->


<font size="5" color="black" face="serif">
<BR>Country</font>
<BR><SELECT NAME="country">
<OPTION VALUE="Nothing">-----Select Country-----
<OPTION VALUE="Brazil">Brazil
<OPTION VALUE="Canada">Canada
<OPTION VALUE="China">China
<OPTION VALUE="Cuba">Cuba
<OPTION VALUE="Cyprus">Cyprus
<OPTION VALUE="Japan">Japan
<OPTION VALUE="Korea">Korea
<OPTION VALUE="Philippines">Philippines
<OPTION VALUE="Spain">Spain
<OPTION VALUE="United States of America">United States of America

</SELECT>


<BR><B>House Phone</B>
<BR><INPUT TYPE="TEXT" NAME="phone">
<BR>

<BR><B>Cell Phone</B>
<BR><INPUT TYPE="TEXT" NAME="cell">
<BR>

<BR><B>Email</B>
<BR><INPUT TYPE="TEXT" NAME="email">
<BR>


<BR><B>Favorite Website</B>
<BR><INPUT TYPE="TEXT" NAME="website">
<BR>

<BR>
<BR><B>Comments</B>
<BR>
<TEXTAREA NAME="textarea" ROWS="8" COLS=50"
 WRAP="physical">
</TEXTAREA>



<!-- multiple select -->

<font size="5" color="black" face="serif">
<BR>Favorite Author</font>
<BR><SELECT MULTIPLE NAME="author[]">
<OPTION VALUE="Akamatsu Ken">Akamatsu Ken
<OPTION VALUE="Kaise Sosuke">Kaise Sousuke
<OPTION VALUE="Maki Yoko">Maki Yoko
<OPTION VALUE="Peach Pit">Peach Pit
<OPTION VALUE="Takahashi Rumiko">Takahashi Rumiko
<OPTION VALUE="Watsuki Nobuhiro">Watsuko Nobuhiro

</SELECT>

<BR>

<!-- check box -->


<font size="5" color="black" face="serif">
<BR>Favorite Anime</font>
<BR><INPUT TYPE="CHECKBOX" 
   NAME="show[]" value="Clover">Clover
<BR><INPUT TYPE="CHECKBOX" 
   NAME="show[]" value="Eureka 7">Eureka 7
<BR><INPUT TYPE="CHECKBOX" 
   NAME="show[]" value="Evangelion">Evangelion
<BR><INPUT TYPE="CHECKBOX" 
   NAME="show[]" value="Full Metal Panic">Full Metal Panic
<BR><INPUT TYPE="CHECKBOX" 
   NAME="show[]" value="Kenshin">Kenshin
<BR><INPUT TYPE="CHECKBOX" 
   NAME="show[]" value="Mars">Mars
<BR><INPUT TYPE="CHECKBOX" 
   NAME="show[]" value="Romeo X Juliet">Romeo X Juliet
<BR><INPUT TYPE="CHECKBOX" 
   NAME="show[]" vaule="Vandread">Vandread

<BR>





    <INPUT TYPE=hidden NAME="martial" VALUE="Anime Form">

<?

    
echo "<input type=hidden name=ip value=\"$REMOTE_ADDR\">\n"
    echo 
"<input type=hidden name=browser value=\"$HTTP_USER_AGENT\">\n";
 
?>

<BR>



<BR><INPUT TYPE="RESET" VALUE="clear all fields">
<BR>
<BR><INPUT TYPE="SUBMIT" Name="Submit" VALUE="Proccess Information">
<BR>


</FORM>
</BODY>
</HTML>
results

PHP Code:
<?php

     
// File animeresults.php
    

     
echo date("F j, Y, g:i a");
    echo 
"<BR>";



         
$errors=0;
         if (!
trim($username))
         {
            echo 
"<BR><B>Username</B> is required.";
            
$errors++;

         }



// Gender

echo "<BR><B>Gender</B> is ";
if (!
$_REQUEST['radiobutton']) echo ("not selected."); 

switch (
$_REQUEST['radiobutton']) 

case 
"Male" : echo "Male"; break; 

case 
"Female" : echo "Female"; break; 






         if (!
trim($birthday))
         {
            echo 
"<BR><B>Birthday</B> is required.";
            
$errors++;

         }

      
     if (!
trim($homeaddress))
         {
            echo 
"<BR><B>Home Address</B> is required.";
            
$errors++;
        
     }

         if (!
trim($homecity))
         {
            echo 
"<BR><B>City</B> is required.";
            
$errors++;
         
         }


         if (!
trim($homestate))
         {
            echo 
"<BR><B>State</B> is required.";
            
$errors++;
         
         }


         if (!
trim($homezip))
         {
            echo 
"<BR><B>Zip</B> is required.";
            
$errors++;
         
         }

//Country

echo "<BR><B>Country</B>";
if( !isset( 
$_POST['country'] ) || empty( $_POST['country'] ) ) 

    echo 
'Error: You must select a country.'

else 

    echo 
'Success: You selected a country.'



//phone



         
if (!trim($phone))
         {
            echo 
"<BR><B>Phone</B> is required.";
            
$errors++;
         
         }

         if (!
trim($cell))
         {
            echo 
"<BR><B>Cell Phone</B> is required.";
            
$errors++;
         
         }

         if (!
trim($email))
         {
            echo 
"<BR><B>Email</B> is required.";
            
$errors++;
         
         }

         if (!
trim($website))
         {
            echo 
"<BR><B>Website</B> is required.";
            
$errors++;
         
         }


// multiple select


//check box





    
if ($errors 0)
       echo 
"<BR><BR><BR>Please use your browser's back button ".
            
"to return to the form, correct ";
    if (
$errors == 1)
       echo 
" the error, ";
    if (
$errors 1)
       echo 
"the errors, ";
    if (
$errors 0)
       echo 
"and re-submit the form.";



?>