function initReq(reqType,url,isAsynch,data)
{ 
	
	request_a.onreadystatechange=handleResponse;
	request_a.open(reqType,url,isAsynch);
	request_a.setRequestHeader("Content-Type","application/x-www-form-urlencoded; charset=UTF-8");
	request_a.send(data);
	//alert(request_a.responseText);

}
function handleResponse()
{

	if(request_a.readyState == 4)
	{
		if(request_a.status == 200)
		{
			opt = request_a.responseText;
			//alert(opt);
			if(opt == 'false')
			{
				alert('You have already rated this Video.');
				return false;

			}
			else
			{
				Rating();
			}
		}
		else 
			alert("A problem occurred with communicating between the XMLHttpRequest object and the server program.");
	}
	
}