ajax onreadystatechange parameter

I want to pass a parameter to the callback function to identify one ajax call from another.  
This code is not doing the business.  Is it possible?  How is it done?
function runscript(page, data, element)
	//get ajax object
	// set callback
	//check there is a connection to server
	if (HTTPrequest[req_no]==null)
		alert ("Browser does not support HTTP Request");
	info['ajax'] += 1;
	info['script'] = page;
	//create script url
	var url=page+".php";
	for(i in data)
	//load the script

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Michel PlungjanIT ExpertCommented:
HTTPrequest[req_no].onreadystatechange=new function () { stateChanged(req_no) }

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