// Timer Value 

	function alwaysConnect() {

	    var http_request = false;
		var url="/ajax_script/online_ajax.php";

        if (window.XMLHttpRequest) { // Mozilla, Safari,...
            http_request = new XMLHttpRequest();
            if (http_request.overrideMimeType) {
                http_request.overrideMimeType('text/xml');
                // On fait des requette en XML
            }
        } else if (window.ActiveXObject) { // IE
            try {
                http_request = new ActiveXObject("Msxml2.XMLHTTP");
            } catch (e) {
                try {
                    http_request = new ActiveXObject("Microsoft.XMLHTTP");
                } catch (e) {}
            }
        }

        if (!http_request) {
            //alert('Abandon :( Impossible de créer une instance XMLHTTP');
            return false;
        }
        http_request.onreadystatechange = function() 
			{
				alertContents(http_request); 
			};
        http_request.open('GET', url, true);
        http_request.send(null);
		// On boucle la fonction
		setTimeout("alwaysConnect();", 3*60*1000);
    }

    function alertContents(http_request) {

        if (http_request.readyState == 4) {
            if (http_request.status == 200)
			{
				//Good =)
                //alert(http_request.responseText);
            } else {
                //alert('Un problème est survenu avec la requête.');
            }
        }
    }
// Lance un timer
setTimeout("alwaysConnect();", 3*60*1000);