function AjaxCallBack(url, vars, callbackFunction, metho)
{
	var request = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject("MSXML2.XMLHTTP.3.0");
	request.open(metho, url, true);
	request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); 
	
	request.onreadystatechange = function()
	{
		//alert(request.readyState + " = " + request.status);
		
		if (request.readyState == 4 && request.status == 200) 
		{
			if (request.responseText)
			{
				callbackFunction(request.responseText);
			}
		}
		else
		{
			//alert("Error. ");
		}
	}
	request.send(vars);
}

function MuestraModalCargando(texto)
{
	
}

function OcultaModalCargando()
{
	
}