ช่วยด้วยครับ รับ 0 และ 1 จาก msql มาแสดงบน checkbox และทำการแก้ไขได้ด้วย

<form name="form1" method="post" action=" ">
                      <table width="99%" border="1" align="center">
                      <tr bgcolor="#CC99FF">
                        <th colspan="8" bgcolor="#FFCCFF" class="e"><h1> <center>
                          จัดการรายชื่อนักศึกษา
                          </center></h1></th>
                        </tr>
                      <tr bgcolor="#FFFFCC">
                        <th width="28" height="38" class="q">No.</th>
                        <th width="86" class="q">Username</th>
                        <th width="53" class="q">Articel</th>
                        <th width="96" class="q">Firstname</th>
                        <th width="99" class="q">Lastname</th>
                        <th width="136" class="q">Email</th>
                        <th width="166" class="q">Department</th>
                        <th width="46"><center>
                          Allow
                          </center></th>
                        </tr>
                      <?php  
 	$sql = "select * from users u,departments d where (d.departmentId = u.departmentId) and level= 'student' order by userName";
	$result = mysql_query($sql);
	$num = mysql_num_rows($result);
	$color = "#CCCC99";
	
	for ($i=1;$i<=$num;$i++){
		$row = mysql_fetch_array($result);
		
		if ($color == "#CCCC99")
		$color = "#CCFFCC";
	else
		$color = "#CCCC99";
		//$color=(@$color=="#ffffff")?"#cccccc":"#ffffff";
	
 ?>
                      <?php if (!empty($username)){
		$sql = "delete from users where userName='$adusername'";
		$result = mysql_query($sql) or die("$sql");
		
		die("<script>alert('xxx'); window.location='xxxx';</script>");
	}?>
                      <tr bgcolor="<?php echo $color ?>">
                        <th height="16" class="text3"><span class="q"><?php echo $i?></span></th>
                        <th class="text3"><?php echo $row["userName"] ?></th>
                        <th class="text3"><?php echo $row["article"] ?></th>
                        <th class="text3"><?php echo $row["firstName"] ?></th>
                        <th class="text3"><?php echo $row["lastName"] ?></th>
                        <th class="text3"><?php echo $row["email"] ?></th>
                        <th class="text3"><?php echo $row["depThaiName"] ?></th>
                        <th>
                        <label><input name="chkallow[]" type="checkbox" value="0" checked ></label>
                          
                          </th>
                      </tr>
                      <?php  } ?>
                      </table>
 <?php echo mysql_error();	 ?>
 
                       <table width="200" border="0" align="center">
                         <tr>
                           <th scope="col"><label>
                             <input type="reset" name="Reset" id="submit" value="Reset">
                           </label>
                             <label>
                               <input type="submit" name="reset" id="reset" value="Submit">
                             </label></th>
                         </tr>
                       </table>
                       </form>