ผมเขียนโค้ดแบบนี้แล้วทำไม java script ไม่ทำงานเลยครับ

<tr>
          <td width="102" align="right">  Branch :</td>
          <td width="481" align="left">
		<select name="branch" id="branch">
            <option value="">-- Select Branch --</option>
            <?
						include"../connect.php";
						$sql="select * from branch";
						$result=mysql_db_query($dbname,$sql);
						$number=mysql_num_rows($result);
						$no=1;
						if($number <> 0){
						While($rs=mysql_fetch_array($result)){
							$branch_id=$rs[branch_id];
							$branch_host=$rs[branch_host];
							$branch_name=$rs[branch_name];
			echo"
					<option value='$branch_name'>$branch_name</option>";
					$no++;
				}
				mysql_close();
				}
				?>
          </select>	 
		<script language="JavaScript" type="text/javascript" >
		  if (theForm.branch.selectedIndex < 0)
			{
		alert("Please select one of the \"Branch\" options.");
		theForm.branch.focus();
		return (false);
		}</script></td>
          <td width="1">&nbsp;</td>
        </tr>