//recup le flux http d'une url
function getxmlhttp(url)
{
	//firefox
	if(window.XMLHttpRequest) xmlhttpobj = new XMLHttpRequest();
	//ie
	else if(window.ActiveXObject) xmlhttpobj = new ActiveXObject("Microsoft.XMLHTTP");
	else return(false);
	//alert("ok");
	//document.write(url);
	xmlhttpobj.open("GET", url, false);
	xmlhttpobj.send(null);
	//alert("ok2");
	//alert(xmlhttpobj.responseText);
	//document.write(xmlhttpobj.responseText);
	if(xmlhttpobj.readyState == 4) return(xmlhttpobj.responseText);
	else return(false);
}