// JavaScript Document

var XMLHttpRequestObject = false;

if (window.XMLHttpRequest) {

	XMLHttpRequestObject = new XMLHttpRequest();

} 

else if (window.ActiveXObject) {

	XMLHttpRequestObject = new ActiveXObject("Microsoft.XMLHTTP");

}

var ajaxLoading = false;

var flag = true;

var taget = false;

function forLoading(id,tagetDiv)

{

	if(flag)

	{

		flag = false;

		target = tagetDiv;

		ajaxLoading = document.getElementById(id);	

		ajaxLoading.style.visibility = "visible"; 

	}

	else

	{

		alert('Wait a while!!! Other availability is being checked');

	}

}

function getData(dataSource, divID)

{

	if(flag || target == divID)

	{

		if(XMLHttpRequestObject) {

			var obj = document.getElementById(divID);

			XMLHttpRequestObject.open("GET", dataSource);

			XMLHttpRequestObject.onreadystatechange = function()

			{

				if (XMLHttpRequestObject.readyState == 4 && XMLHttpRequestObject.status == 200) 

				{				

					ajaxLoading.style.visibility = "hidden"; 

					obj.innerHTML = XMLHttpRequestObject.responseText;

					flag = true;

				}

			}

			XMLHttpRequestObject.send(null);

		}

	}

}