Ajax - Load page

[Osterling]

I cannot seem to get this function to load the page in Internet Explorer, but it will in Firefox. I really cannot figure this one out. It's day two of problem shooting, and I just am stumped. Below is the function.

<script>
function statusEnableDisable(page,usediv, form) 
{
	// Set up request varible
	try {
		xmlhttp = window.XMLHttpRequest ? new XMLHttpRequest(): new ActiveXObject("Microsoft.XMLHTTP");
	}  
	catch (e) { 
		alert("Error: Could not load page.");
	}
	
	if(form == "photoalbum"){
		var object = document.getElementById('photoalbum').selectedIndex;
		
		if(object == "1"){
		status = "Enabled";
		}
		else if(object == "2"){
			status = "Disabled";
		}	
	}
	else if(form == "file"){
		var object = document.getElementById('filestorage').selectedIndex;
		
		if(object == "1"){
		status = "Enabled";
		}
		else if(object == "2"){
			status = "Disabled";
		}	
	}
	
	page = page + "status=" + status;
	page = page + "&form=" + form;
	alert(page);
	
	//Show page is loading
	document.getElementById(usediv).innerHTML = 'Loading Page...';
	
	//scroll to top
	scroll(0,0);
	
	//send data
	xmlhttp.onreadystatechange = function(){
		//Check page is completed and there were no problems.
		if ((xmlhttp.readyState == 4) && (xmlhttp.status == 200)) {
			//Write data returned to page
			document.getElementById(usediv).innerHTML = xmlhttp.responseText;
		}
	}
	
	xmlhttp.open("GET", page);
	xmlhttp.send(null);
	
	//Stop any link loading normaly
	return false;
}
</script>

page alerts the correct URL which is: php/updateEnableDisable.php?status=Disabled&form=file

If anyone can spot anything that might be causing this to fail in Internet Explorer, I would appreciate the advice. Thank you