function prodcheck(pid){
var pcode =document.getElementById(pid).value;
var myUrl = "/storage/checkpid";
var myAjax = new Ajax.Request(myUrl,{
method:'post',
parameters:{'id':pcode},
onComplete:function(val){
var arr = eval(val.responseText);
if(arr!=null){
alert(arr);
}
}
});
}