[ajax] Problem med flera open efter varandra

function loaddata(div_id){
    
	var element = document.getElementById(div_id);
	element.innerHTML = "Loading...";
        var xmlhttp = getXmlHttpObj();
	xmlhttp.abort();
	xmlhttp.open("GET", 'foo.php?id='+div_id);
	xmlhttp.onreadystatechange = function() {
		if(xmlhttp.readyState == 4 && xmlhttp.status == 200) {	
			element.innerHTML = xmlhttp.responseText;
		}
	}
	xmlhttp.send(null);
}

function getXmlHttpObj() {
       var xmlhttp;
	/*@cc_on
	@if (@_jscript_version >= 5)
	try {
		xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
	} catch (e) {
		try {
			xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
		} catch (E) {
			xmlhttp = false;
		}
	}
	@else
	xmlhttp = false;
	@end @*/
	if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {
		try {
			xmlhttp = new XMLHttpRequest();
		} catch (e) {
			xmlhttp = false;
		}
	}
	return xmlhttp;
}