function conect(url, onload){
var xmlHttp
unique=new Date().getTime()
if(url.indexOf("?")!=-1){
	url+="&unique="+unique
}else{
	url+="?unique="+unique
}
xmlHttp=GetXmlHttpObject(onload)
xmlHttp.open("GET", url , true)
xmlHttp.send(null)
return xmlHttp
};
function GetXmlHttpObject(handler){ 
	var objXmlHttp=null
	if (navigator.userAgent.indexOf("Opera")>=0){
		alert("Esta aplicación no funiona en Opera") 
		return 
	}
	if (navigator.userAgent.indexOf("MSIE")>=0){ 
		var strName="Msxml2.XMLHTTP"
		if (navigator.appVersion.indexOf("MSIE 5.5")>=0){
			strName="Microsoft.XMLHTTP"
		} 
		try{ 
			objXmlHttp=new ActiveXObject(strName)
			objXmlHttp.onreadystatechange=handler 
			return objXmlHttp
		} 
		catch(e){ 
			alert("Error. Scripting for ActiveX might be disabled") 
			return 
		} 
	} 
	if (navigator.userAgent.indexOf("Mozilla")>=0){
		objXmlHttp=new XMLHttpRequest()
		objXmlHttp.onload=handler
		objXmlHttp.onerror=handler 
		return objXmlHttp
	}
};