javascript dropdown ค่ะ รบกวนช่วยดูโค้ด javascript บรรทัดที่ 55-103 หน่อยคะ

<?php
@session_start();
$id=$sessiondata["id"];
include("head.php");
include("config.php");
?>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="description" content="Place your description here" /> 
<meta name="keywords" content="put, your, keyword, here" /> 
<meta name="author" content="Templates.com - website templates provider" /> 
<link href="style.css" rel="stylesheet" type="text/css" />
	<link type="text/css" href="css/ui-lightness/jquery-ui-1.8.10.custom.css" rel="stylesheet" />
    <script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" >

function login(ches){    

var str = Math.random();
var datastring = 'str'+str + '&ches='+ches ;
$.ajax({type:'POST',url:'che.php',data:datastring,success:function(data){
	//alert(data);

if(data=="ME"){
$("#MEE").html("<font color=red>ซ้ำ</font>");

}
else{
	$("#MEE").html("<font color=green>ใช้ได้</font>");
	}
}
});
}
</script>