function addLoadEvent(func) {
    var oldonload = window.onload;
    if (typeof window.onload != 'function') {
        window.onload = func;
    } else {
        window.onload = function () {
            if (oldonload) {
                oldonload();
            }
            func();
        }
    }
}


function loadStart(contentPanel, loadPanel) {
    contentPanel.innerHTML = '';
    contentPanel.style.display = 'none';
    loadPanel.style.display = 'block';
}

function loadSuccess(contentPanel, loadPanel, response) {
    contentPanel.innerHTML = response.responseText;
    loadPanel.style.display = 'none';
    contentPanel.style.display = 'block';
}


function getTarget(evt) {
    if (evt.srcElement)
        return evt.srcElement;
    else
        return evt.target;
}

function isEnter(e) {
    var keynum;

    keynum = getKeyNum(e);
    if (keynum == 13) {
        if (navigator.appName == 'Microsoft Internet Explorer')
            e.keyCode = 0;
        return true;
    }
    else {
        return false;
    }
}

function getKeyNum(e) {
    var keynum;
    if (window.event) // IE
    {
        keynum = e.keyCode;
    }
    else if (e.which) // Netscape/Firefox/Opera
    {
        keynum = e.which;
    }
    return keynum;
}