สวัสดีคะ สอบถามเรื่อง dropdownmenu ทำใน localhost ในเครื่องผลมันถูกต้องทุกอย่างคะ แต่พอลงไปใน host จริง ไม่ได้คะ

include "connect.php";

echo $sql;

$DepartmentID=$_GET['Department'];
<select name="Department">
<? 
while($Depart=mysql_fetch_array($result)){
  if($DepartmentID==$Depart['DepartmentID']){
   $sel="selected";
  }else{
   $sel="";
  }
?>
<option value="<?=$Depart['DepartmentID']?>" <?=$sel;?>><?=$Depart['Department']?></option>
<?
}
?>
</select>

<SELECT NAME="ref_groupitem" id="ref_groupitem" onChange="location.href='add_booking.php?ref_groupitem='+this.value;" style="width:200px">
     <OPTION VALUE="0">::เลือกคอนโด::</OPTION>
     <?
       include "connect.php";
      $sql_gro="select * from buding";
      mysql_query('SET CHARACTER SET tis620');
        mysql_query('SET collation_connection = "tis620_thai_ci"');
      $result_gro=mysql_query($sql_gro);
        while($rs_gro=mysql_fetch_array($result_gro)) {
         $buding_id=$rs_gro[buding_id];
         $buding_name=$rs_gro[buding_name];
         if ($ref_groupitem==$buding_id) {
            echo "<OPTION VALUE='$buding_id' SELECTED>$buding_name</OPTION>";
         } else {
            echo "<OPTION VALUE='$buding_id' >$buding_name</OPTION>";
         }
      }
     ?>
      </SELECT>
	  <?
$ref_groupitem=$_GET['ref_groupitem']; 
if($ref_groupitem != ""){ 
    //  include "connect.php";
      $sql_cat="select * from foor where buding_id='$ref_groupitem' ";
      $result_cat=mysql_query($sql_cat);	  
	  ?>
	  <SELECT NAME="ref_category" id="ref_category" onChange="location.href='add_booking.php?ref_category='+this.value+'&ref_groupitem=<?=$ref_groupitem;?>';"  style="width:200px">
     <OPTION VALUE="0">::ประเภทชั้น::</OPTION>
     <?
     
        while($rs_cat=mysql_fetch_array($result_cat)) {
         $foor_id=$rs_cat[foor_id];
         $foor_name=$rs_cat[foor_name];
         if($ref_category==$foor_id){
		 $sel="selected";
  }else{
   $sel="";
  }
         ?>
<option value="<?=$foor_id?>" <?=$sel;?>><?=$foor_name?></option>
<?
}
?>  
   
      </SELECT>
<?
$ref_category=$_GET['ref_category']; 
       if($ref_category != ""){  
	   $sql="select * from room where foor_id='$ref_category' ";
      $result=mysql_query($sql);
?>
<SELECT NAME="room_id"  style="width:200px">
     <OPTION VALUE="0">::เลือกห้อง::</OPTION>
     <?
	 
   //   include "connect.php";
      
        while($rs=mysql_fetch_array($result)) {
         $room_id=$rs[room_id];
         $room_name=$rs[room_name];
         if($room_id==$room_id){
           $sel="selected";
  }else{
   $sel="";
  }
         ?>
<option value="<?=$room_id?>" <?=$sel;?>><?=$room_name?></option>
<?
} } }
?>  
      </SELECT>