To search data according to input from 3 fields from 3 tables

<form name="search" action="" enctype="multipart/form-data">
   <table width="100px" border="0"  cellpadding="2" class="table" style="float:left;">
  <tr align="center" valign="middle" bgcolor="#CCCCCC">
     <td><strong>From Date</strong></td>
     <td><input type="text" name="from_date1" id="from_date1" readonly="1" />
     <script type="text/javascript">
        function catcalc(cal) {
        var date = cal.date;
        var time = date.getTime()
        // use the _other_ field
        var field = document.getElementById("from_date1");
        if (field == cal.params.inputField) {
            field = document.getElementById("from_date1");
            }
            //field.value = date2.print("%d-%m-%Y");
    }
    Calendar.setup({
        inputField     :    "from_date1",   // id of the input field
        ifFormat       :    "%Y-%m-%d",       // format of the input field
        showsTime      :    false,
        timeFormat     :    "24",
        onUpdate       :    catcalc
    });
</script>
     
     </td>
     <td><strong>To Date</strong></td>
     <td><input type="text" name="to_date1" id="to_date1" readonly="1" />
     <script type="text/javascript">
     function catcalc(cal) {
        var date = cal.date;
        var time = date.getTime()
        // use the _other_ field
        var field = document.getElementById("to_date1");
        if (field == cal.params.inputField) {
            field = document.getElementById("to_date1");
            }
    }
    Calendar.setup({
        inputField     :    "to_date1",   // id of the input field
        ifFormat       :    "%Y-%m-%d",       // format of the input field
        showsTime      :    false,
        timeFormat     :    "24",
        onUpdate       :    catcalc
    });
</script>
     </td>
     <td><strong>Employee Type</strong></td>
     <td>
    <select name="emp_type_id1" id="emp_type_id1">
        <option value="0">---Select---</option>
         
          <option value="1">Executive</option>
          <option value="2">Non-Executive</option>
          </select>
     </td>
     <td><input name="Search" type="submit" value="Search"/></td>
  </tr>
</table>
</form>

Here i want that user will search according to the three fields and clicking on search button will show the employee names .But the data has to retrieved from 3 tables, as my from-date and to_date is in another table and employee-type is in another table and employee-name is in another table, but in three tables emp_id is common.

And i want to show the data in the same page.

… and how are these tables structured?