var isIE = false;
var req;
var DIV;
function cargaXML(url,obj,variables) 
{
    DIV=obj;
	//DIV.style.display="";
	if (window.XMLHttpRequest)
	{
		req = new XMLHttpRequest();
		req.onreadystatechange = processReqChange;
			req.open("POST", url, true);
			 req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
		     req.send(variables);
	} 
	else if (window.ActiveXObject) 
	{
		isIE = true;
		req = new ActiveXObject("Microsoft.XMLHTTP");
		if (req) 
		{
			req.onreadystatechange = processReqChange;
			req.open("POST", url, true);
		    req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
		     req.send(variables);
		}
	}
}
function carga_POST_XML(url,obj,variables) 
{
    DIV=obj;
	//DIV.style.display="";
	if (window.XMLHttpRequest)
	{
		req = new XMLHttpRequest();
		req.onreadystatechange = processReqChange;
			req.open("POST", url, true);
			 req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
		     req.send(variables);
	} 
	else if (window.ActiveXObject) 
	{
		isIE = true;
		req = new ActiveXObject("Microsoft.XMLHTTP");
		if (req) 
		{
			req.onreadystatechange = processReqChange;
			req.open("POST", url, true);
		    req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
		     req.send(variables);
		}
	}
}

//*************************************************************************
function processReqChange(){
	if(req.readyState == 4){
		DIV.innerHTML = req.responseText;
		PASO1_LISTO=true;
		VALOR_COSTO=true;
	} 
	else {
		DIV.innerHTML = '<img src="loading.gif"/>';
	}
}