function createRequest() {
	var request = null;
	
	try {
    	request = new XMLHttpRequest();
    }catch(trymicrosoft) {
    	try{
        	request =  new ActiveXObject("Msxml2.XMLHTTP");
        }catch(othermicrosoft) {
        	try{
            	request = new ActiveXObject("Microsoft.XMLHTTP");
            }catch(failed){
            	request = null;
            }
        }
    }
    
    if(request==null) {
    	alert("Your browser does not support ajax!");
    }
	
	return request;
}