function createXMLHttpRequest(){
	
	var ajaxRequest;
 
	if(window.XMLHttpRequest){
		try {
			ajaxRequest = new XMLHttpRequest();
		} 
		catch(e) {
			ajaxRequest = null;
		}
	}else if(window.ActiveXObject){
		try	{
        	ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
    	} 
		catch(e) {
        	try {
            	ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
        	} 
			catch(e) {
            	ajaxRequest = null;
			}
        }
    } else {
		ajaxRequest = null;
	}
	
	return ajaxRequest;
}