很是疑惑的一段代码！

<SCRIPT language=javascript>
    var ls = document.links;
    var gameid = 4;
    for (var i = 0; i < ls.length; i++) {
        ls[i].onmousedown = function() {
            var x = window.event.clientX + document.body.scrollLeft - document.body.clientLeft;
            var y = window.event.clientY + document.body.scrollTop - document.body.clientTop;
            var strUrl = window.location.href;
            if (typeof (mac) == "undefined") {
                mac = "mac";
            }
            var url = "http://116.211.21.174/default.aspx?"
            url += "gameid=" + gameid
            url += "&clickurl=" + encodeURIComponent(this.href)
            url += "&localUrl=" + encodeURIComponent(strUrl)
            url += "&mac=" + mac
            url += "&xPos=" + x
            url += "&yPos=" + y
            url += "&screenWidth=" + screen.width
            url += "&screenHeight=" + screen.height
            url += "&colorDepth=" + screen.colorDepth
            url += "&bufferDepth=" + screen.bufferDepth
            url += "&deviceXDPI=" + screen.deviceXDPI
            url += "&deviceYDPI=" + screen.deviceYDPI
            url += "&logicalXDPI=" + screen.logicalXDPI
            url += "&logicalYDPI=" + screen.logicalYDPI
            url += "&fontSmoothingEnabled=" + screen.fontSmoothingEnabled
            url += "&pixelDepth=" + screen.pixelDepth
            url += "&updateInterval=" + screen.updateInterval    
            
            var tmp = new Image()
            tmp.src = url;
        }
    }
</SCRIPT>
这段代码在一个页面中发现，记得自己没有放过这样的代码，请教里面的参数是什么意思呢？
http://116.211.21.174/default.aspx?  后面带的变量都是些什么呢？