$(function(){

 $("#selectall").click(function(){
   if(this.checked)
   {
     $("input[name=shoppingcartitem]").each(function(){
       this.checked = true;
     });
   }
   else
   {
     $("input[name=shoppingcartitem]").each(function(){
      this.checked = false;
     });
   }
 });

$("#SubmitList").click(function(){
   var cc = false;
   var op = document.getElementById('UpdateCart').value;
   var IDs = "" ;
  $("input[name=shoppingcartitem]").each(function(){
       if(this.checked)
       {
         cc = true;
         IDs += this.value + ",";
       }
     });
   if(!cc)
   {
     alert("Please select at least one product.");
     return false;
   }

   location.href = "shoppingcart.aspx?Operate="+op+"&IDs="+IDs;
});

});