function createXMLHTTP() 
{
	var ajax;
	try 
	{
		ajax = new ActiveXObject("Microsoft.XMLHTTP");
	} 
	catch(e) 
	{
		try 
		{
			ajax = new ActiveXObject("Msxml2.XMLHTTP");
			alert(ajax);
		}
		catch(ex) 
		{
			try 
			{
				ajax = new XMLHttpRequest();
			}
			catch(exc) 
			{
				 alert("Esse browser no tem recursos para uso do Ajax");
				 ajax = null;
			}
		}
		return ajax;
	}


	   var arrSignatures = ["MSXML2.XMLHTTP.5.0", "MSXML2.XMLHTTP.4.0",
							"MSXML2.XMLHTTP.3.0", "MSXML2.XMLHTTP",
							"Microsoft.XMLHTTP"];
	   for (var i=0; i < arrSignatures.length; i++) 
	   {
			try 
			{
				var oRequest = new ActiveXObject(arrSignatures[i]);
				return oRequest;
			} 
			catch (oError) 
			{
			}
	   }
	
		   throw new Error("MSXML is not installed on your system.");
}
	
function GetAjax(objval,objret, url)
{
	var xmlHttp = createXMLHTTP();
	
	xmlHttp.open("post", url, true);
	xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	xmlHttp.onreadystatechange = function(){
		   										if (xmlHttp.readyState==4){
													//abaixo o texto gerado no arquivo ASP  colocado no div
					  								objret.innerHTML = xmlHttp.responseText;
												}
										   }
	xmlHttp.send( url + "&param=" + objval.value);
}