var AjaxHandler =
{
	StartRequest: function(requestUrl, callbackFunction)
	{
		var xmlHttp;
		try
		{
			// Firefox, Opera 8.0+, Safari
			xmlHttp=new XMLHttpRequest();
		}
		catch(e)
		{
			// Internet Explorer
			try
			{
				xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
			}
			catch(e)
			{
				try
				{
					xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
				}
				catch(e)
				{
					alert("Your browser does not support AJAX!");
					return false;
				}
			}
		}
		xmlHttp.onreadystatechange=function()
		{
			if(xmlHttp.readyState==4)
			{
				//--- Read JSON data ---
				var jsonData = eval("(" + xmlHttp.responseXML.documentElement.childNodes[0].nodeValue + ")");
				//--- Callback ---
				callbackFunction(jsonData);
			}
		}
		xmlHttp.open("GET", requestUrl, true);
		xmlHttp.send(null);
	}
}