Rails spinoffs - May 2008 - translate Ajax request with prototype

I use the following function in a cross-site application :
				function Req_file(url) {
					var req;
					if (window.XMLHttpRequest) {
						req = new XMLHttpRequest();
					} else if (window.ActiveXObject) {
						req = new ActiveXObject("Microsoft.XMLHTTP");
					} else return(false);
				  req.open("GET", url, false);
				  req.send(null);
				  if (req.readyState == 4) return(req.responseText);
				  return(false);
				}
It works with IE7 with the cross domain option activated.
I would like translate it with prototype.js, to be able to use
crossSite: true in Ajax.request with the transport.js plugin.
Could you help me to make this translation ?

Thanks for your help.

Pierre
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