function imageOn(img, id) {
    id.src = img;
}
function imageOff(img, id) {
    id.src = img;
}
function fontSizeSmall() {
    document.body.style.fontSize = '12px';
}
function fontSizeMedium() {
    document.body.style.fontSize = '14px';
}
function fontSizeLarge() {
    document.body.style.fontSize = '16px';
}
function activateTab(pageId, tabid) {

    var tabCtrl = document.getElementById('tabCtrl');
    var tabareaheader = document.getElementById('tabAreaHeader');

    var tabActivated = document.getElementById(tabid);
    var pageToActivate = document.getElementById(pageId);

    for (var i = 0; i < tabCtrl.childNodes.length; i++) {
        var node = tabCtrl.childNodes[i];
        if (node.nodeType == 1) { /* Element */
            node.style.display = (node == pageToActivate) ? 'block' : 'none';
        }
    }

    for (var i = 0; i < tabareaheader.childNodes.length; i++) {
        var node = tabareaheader.childNodes[i];
        if (node.nodeType == 1) { /* Element */
            k = node.id.substring(3, 4);
            if (node == tabActivated) {
                node.className = "tab" + k + " activeTab";
                //node.blur();
            }
            else
                node.className = "tab" + k;

        }
    }
}
function onSilverlightError(sender, args) {
    var appSource = "";
    if (sender != null && sender != 0) {
        appSource = sender.getHost().Source;
    }

    var errorType = args.ErrorType;
    var iErrorCode = args.ErrorCode;

    if (errorType == "ImageError" || errorType == "MediaError") {
        return;
    }

    var errMsg = "Unhandled Error in Silverlight Application " + appSource + "\n";

    errMsg += "Code: " + iErrorCode + "    \n";
    errMsg += "Category: " + errorType + "       \n";
    errMsg += "Message: " + args.ErrorMessage + "     \n";

    if (errorType == "ParserError") {
        errMsg += "File: " + args.xamlFile + "     \n";
        errMsg += "Line: " + args.lineNumber + "     \n";
        errMsg += "Position: " + args.charPosition + "     \n";
    }
    else if (errorType == "RuntimeError") {
        if (args.lineNumber != 0) {
            errMsg += "Line: " + args.lineNumber + "     \n";
            errMsg += "Position: " + args.charPosition + "     \n";
        }
        errMsg += "MethodName: " + args.methodName + "     \n";
    }

    throw new Error(errMsg);
}
function printScreen() {
    print();
}
function validateLogin(source, arguments) {

    arguments.IsValid = true;
    
    if (document.getElementById('ctl00_ContentPlaceHolder1_username').value == "" && document.getElementById('ctl00_ContentPlaceHolder1_email').value == "") {
        arguments.IsValid = false;
    }

    if (document.getElementById('ctl00_ContentPlaceHolder1_username').value != "" && document.getElementById('ctl00_ContentPlaceHolder1_email').value != "") {
        arguments.IsValid = false;
    }
    
}