Help needed ... pls help me delete of a data from databse

hi there ...
i need the data to be deleted from the database upon clicking delete button possible ...
pls help ...
thanks ....

<?
include ("topbar.php");      
print ("<table width=800 border=0 align=center>");
print ("<tr>");
print ("<td valign=top><table width=300 border=0>");
print ("<tr>");
print ("<td colspan=2><font size=4><b> Delete Account</b></font></td>");
print ("</tr>");
print ("<tr>");
print ("<td width=150><font size=3>Department:</font></td>");
print ("<td width=150>");

     $query = "select * from Department order by deptName";
$query_result = mysql_query ($query, $mysql_connection);

print("<form action='deleteaccount.php' method=POST name='department'>");
     // Use a droplist to display all categories from the Category table
   
     $displaydepartment = "<select name='deptID' onchange='return refresh_page(this.value)'> <option value=0> -- Select One -- </option>";
                      
                           while ($departmentlist = mysql_fetch_array($query_result))
                         {
                                     
                                   $deptID = $departmentlist["deptID"];
                                   $deptName = $departmentlist["deptName"];
                             
                                            if (!empty($_GET['deptID']))
                                             {
                                          //       $displaydepartment .= "<option value = ".$deptID.">".$deptName."</option>";
                                          $displaydepartment .= "<option value ='".$deptID."' ". ($deptID==$_REQUEST["deptID"]?"selected":"").">".$deptName."</option>";
                                          }
                                          else
                                          {
                                          //$displaydepartment .= "<option value ='".$deptID."' ". ($deptID==$_REQUEST["deptID"]?"selected":"").">".$deptName."</option>";
                               $displaydepartment .= "<option value = ".$deptID.">".$deptName."</option>";
                                          }
                                     }
                                     
$displaydepartment .= "</select>";
print $displaydepartment;      

print ("</td>");
print ("</tr>");
print ("<tr>");
print ("<td><font size=3>Staff Name:</font></td>");
print ("<td>");
            if (!empty($_GET['deptID']))
       {
    $query1 = "select * from Staff where deptID='".$_REQUEST["deptID"]."' order by staffName";
   //  $query1 = "select * from Staff where deptID= '$deptID' order by staffName";
     $query_result1 = mysql_query ($query1, $mysql_connection);
}
else
{
$query1 = "select * from Staff where deptID= '0' order by staffName";
     $query_result1 = mysql_query ($query1, $mysql_connection);
       }
print("<form action='deleteaccount.php' method=POST>");
     // Use a droplist to display all categories from the Category table
     
     $displaystaff = "<select name='staffID'> <option value=0> -- Select One -- </option>";
               while ($stafflist = mysql_fetch_array($query_result1))
                         {
                                   $staffID = $stafflist["staffID"];
                                   $staffName = $stafflist["staffName"];
                                   $displaystaff .= "<option value = ".$staffID.">".$staffName."</option>";
                         }
$displaystaff .= "</select>";
print $displaystaff;    
print ("</td>");
print ("</tr>");
print ("<tr>");
print ("<td>");
print ("<input type=reset type=reset value='Clear'></td>");
print ("<td>");
print ("<input type='submit' name ='delete' value='Delete'></td>");
print ("</tr>");
print ("<tr>");
print ("<td>&nbsp;</td>");
print ("<td>&nbsp;</td>");
print ("</tr>");
print ("</table></td>");
print ("</form>");
print ("</tr>");
include ("bottombar.php");
 ?>
<script language="javascript">
function refresh_page(dept_id)
{
     top.location.href= "deleteaccount.php?deptID=" + dept_id; //change department.php with your php file name
     return false;
}
</script>