function makeRequest(url) {
        var http_request = false;

        if (window.XMLHttpRequest) { // Mozilla, Safari, ...
            http_request = new XMLHttpRequest();
            if (http_request.overrideMimeType) {
                http_request.overrideMimeType('text/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) {
            return false;
        }
        http_request.onreadystatechange = function() { injectTable(http_request); };
        http_request.open('GET', url, true);
        http_request.send(null);

       }
       
   function updateContents() {
	//fetch the data and update
	makeRequest("sw_table.php");
	//run this function again in 30 seconds
	self.setTimeout("updateContents()", 30 * 1000);
   }
   
   function injectTable(http_request) {
	if (http_request.readyState == 4) {
            if (http_request.status == 200) {
		document.getElementById("stock_table").innerHTML=http_request.responseText
            } else {
                document.getElementById("stock_table").innerHTML='Loading live console tracking information.';
            }
        }
   }