// adds a function to the page onload event
function addLoadEvent(func) {
    var oldonload = window.onload;
    if (typeof window.onload != 'function') {
        window.onload = func;
    } else {
        window.onload = function() {
            if (oldonload) {
                oldonload();
            }
            func();
        }
    }
}

// retrieve querystring variables from client side javascript
// optional default value for when a key does not exist
function getQuerystring(key, default_) {
    if (default_ == null) default_ = "";
    key = key.replace(/[\[]/, "\\\[").replace(/[\]]/, "\\\]");
    var regex = new RegExp("[\\?&]" + key + "=([^&#]*)");
    var qs = regex.exec(window.location.href);
    if (qs == null)
        return default_;
    else
        return qs[1];
}

var pageTracker;
function onLoadLogSilverlight() {
    var version = getSilverlightVersion();
    if (version) {
        if ((pageTracker) != null) 
            pageTracker._setVar(version);
        
         }
}

function getSilverlightVersion() {
    var version = '';
    var container = null;
    try {
        var control = null;
        if (window.ActiveXObject) {
            control = new ActiveXObject('AgControl.AgControl');
        }
        else {
            if (navigator.plugins['Silverlight Plug-In']) {
                container = document.createElement('div');
                document.body.appendChild(container);
                container.innerHTML = '<embed type="application/x-silverlight" src="data:," />';
                control = container.childNodes[0];
            }
        }
        if (control) {
           if (control.isVersionSupported('3.0')) { version = 'Silverlight/3.0'; }      
            else if (control.isVersionSupported('2.0')) { version = 'Silverlight/2.0'; }
            else if (control.isVersionSupported('1.0')) { version = 'Silverlight/1.0'; }
            else { version = 'not installed'; }
        }
    }
    catch (e) { }
    if (container) {
        document.body.removeChild(container);
    }
    return version;
}