var http = false;

if(navigator.appName == "Microsoft Internet Explorer") {
	http = new ActiveXObject("Microsoft.XMLHTTP");
} else {
	http = new XMLHttpRequest();
}

function get(url) {
	
	http.abort();
	http.open("GET", url, true);
	http.onreadystatechange=function() {
		if(http.readyState == 4) {
			if(http.responseText == 'allclear') {
				document.getElementById('hideall').style.display = "block";
			}			
		}
	}
	http.send(null);
	
}