function openWindow(url, key, widthVal, heightVal) {
    if (!widthVal) widthVal = 550;
    if (!heightVal) heightVal = 450;

    leftVal = (screen.width - widthVal) / 2;
    topVal = (screen.height - heightVal) / 2;

    parameters = 'status=1,toolbar=0,menubar=0,height=' + heightVal + ',width=' + widthVal + ',left=' + leftVal + ',top=' + topVal + ',scrollbars=1'
    window.open(url, key, parameters);
}

function checkForEnter(e, funEnter, funEsc) {
    if (!e) e = window.event;

    if (e.keyCode == 13 && funEnter) {
        funEnter(); return false;
    }
    else if (e.keyCode == 27 && funEsc) {

        funEsc(); return false;
    }
}

// TabManager управляет отображением 'вкладок'
function TabManager(containerId) {
    this.container_ = $get(containerId);
}

TabManager.prototype.selectTab = function(tabId) {
    var tabToSelect = $get(tabId);
    if (!tabToSelect) return;

    for (i = 0; i < this.container_.childNodes.length; i++)
        if (this.container_.childNodes[i].nodeName == "DIV")
        this.container_.childNodes[i].style.display = "none";

    tabToSelect.style.display = "block";
}

function showDiv(divId) { document.getElementById(divId).style.display = "block"; }

function hideDiv(divId) { document.getElementById(divId).style.display = "none"; }

function validateEmail(email) {
    var expr = new RegExp("^\s*[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\s*$", "i");
    if (expr.test(email)) return true;
    else { alert("Неверный Email адрес"); return false; }
}