var xmlHttp;

function GetXmlHttpObj(pUrl, pFunc)
{
    xmlHttp=GetXmlHttpObject();
    if (xmlHttp==null)
        {
        alert ("Your browser does not support AJAX!");
        return false;
        } 
    xmlHttp.onreadystatechange=pFunc;
    xmlHttp.open("GET",pUrl,true);
    xmlHttp.send(null);
        
    return true;
}

function PostXmlHttpObj(pUrl, pFunc, pValores)
{
    xmlHttp=GetXmlHttpObject();

    if (xmlHttp==null)
        {
        alert ("Your browser does not support AJAX!");
        return false;
        } 

    xmlHttp.onreadystatechange=pFunc;
    xmlHttp.open("POST",pUrl,true);
	xmlHttp.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
    xmlHttp.send(pValores);
        
    return true;
}

function GetXmlHttpObject()
{
    var xmlHttp=null;

    try
        {
        // Firefox, Opera 8.0+, Safari
        xmlHttp=new XMLHttpRequest();
        } catch (e) {
            // Internet Explorer
            try {
                xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
                }
            catch (e) {
                xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
                }
            }
            
    return xmlHttp;
}