function createRequestObject() {
    var ro;
    var browser = navigator.appName;
    if(browser == "Microsoft Internet Explorer"){
        ro = new ActiveXObject("Microsoft.XMLHTTP");
    }else{
        ro = new XMLHttpRequest();
    }
    return ro;
}
var http = createRequestObject();

function ajax(src, target) {
	http.open("GET", 'ajax/'+src, true);
	http.onreadystatechange=function() {
		if(http.readyState == 4) {
			document.getElementById(target).innerHTML = http.responseText;
		}
	}
	http.send(null);
}