function HideObj(obj) {
    try { $get(obj).className = 'hideObject'; }
    catch (Error) { }
}

function ShowObj(obj) {
    try { $get(obj).className = 'showObject'; }
    catch (Error) { }
}  

function open_win(href) 
{
    window.open(href, "_blank"); //, "toolbar=yes, location=yes, directories=no, status=no, menubar=yes, scrollbars=yes, resizable=no, copyhistory=yes"
}

function centerUpdatePanel() {
    centerElementOnScreen(document.getElementById("ajxDefaultLoadingPanel"));
}

function centerElementOnScreen(element) {
    var scrollTop = document.body.scrollTop;
    var scrollLeft = document.body.scrollLeft;

    var viewPortHeight = document.body.clientHeight;
    var viewPortWidth = document.body.clientWidth;

    if (document.compatMode == "CSS1Compat") {
        viewPortHeight = document.documentElement.clientHeight;
        viewPortWidth = document.documentElement.clientWidth;

        scrollTop = document.documentElement.scrollTop;
        scrollLeft = document.documentElement.scrollLeft;
    }

    var topOffset = Math.ceil(viewPortHeight / 2 - element.offsetHeight / 2);
    var leftOffset = Math.ceil(viewPortWidth / 2 - element.offsetWidth / 2);

    var top = scrollTop + topOffset - 40;
    var left = scrollLeft + leftOffset - 70;

    element.style.position = "absolute";
    element.style.top = top + "px";
    element.style.left = left + "px";
}


function Querystring(qs) { // optionally pass a querystring to parse
    this.params = {};

    if (qs == null) qs = location.search.substring(1, location.search.length);
    if (qs.length == 0) return;

    // Turn <plus> back to <space>
    // See: http://www.w3.org/TR/REC-html40/interact/forms.html#h-17.13.4.1
    qs = qs.replace(/\+/g, ' ');
    var args = qs.split('&'); // parse out name/value pairs separated via &

    // split out each name=value pair
    for (var i = 0; i < args.length; i++) {
        var pair = args[i].split('=');
        var name = decodeURIComponent(pair[0]);

        var value = (pair.length == 2)
			? decodeURIComponent(pair[1])
			: name;

        this.params[name] = value;
    }
}

Querystring.prototype.get = function(key, default_) {
    var value = this.params[key];
    return (value != null) ? value : default_;
}

Querystring.prototype.contains = function(key) {
    var value = this.params[key];
    return (value != null);
}