//Validation script for Newsletter entry
function checkemail()
{
    var testresults = false;
    var str = document.validation.email.value;
    var filter = /^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i;

    if (filter.test(str))
        testresults = true;
    else
    {
        alert("Please input a valid email address!")
        testresults = false;
    }

    return (testresults);
}

function checkbae()
{
    if (document.layers || document.getElementById || document.all)
        return checkemail();
    else
        return true;
}

$.fn.centerInClient = function(options) {
    /// <summary>Centers the selected items in the browser window. Takes into account scroll position.
    /// Ideally the selected set should only match a single element.
    /// </summary>    
    /// <param name="fn" type="Function">Optional function called when centering is complete. Passed DOM element as parameter</param>    
    /// <param name="forceAbsolute" type="Boolean">if true forces the element to be removed from the document flow 
    ///  and attached to the body element to ensure proper absolute positioning. 
    /// Be aware that this may cause ID hierachy for CSS styles to be affected.
    /// </param>
    /// <returns type="jQuery" />
    var opt = { forceAbsolute: false,
                container: window,    // selector of element to center in
                completeHandler: null
              };
    $.extend(opt, options);
   
    return this.each(function(i) {
        var el = $(this);
        var jWin = $(opt.container);
        var isWin = opt.container == window;

        // force to the top of document to ENSURE that 
        // document absolute positioning is available
        if (opt.forceAbsolute) {
            if (isWin)
                el.remove().appendTo("body");
            else
                el.remove().appendTo(jWin.get(0));
        }

        // have to make absolute
        el.css("position", "absolute");

        // height is off a bit so fudge it
        var heightFudge = isWin ? 2.0 : 1.8;

        var x = (isWin ? jWin.width() : jWin.outerWidth()) / 2 - el.outerWidth() / 2;
        var y = (isWin ? jWin.height() : jWin.outerHeight()) / heightFudge - el.outerHeight() / 2;

        el.css("left", x + jWin.scrollLeft());
        el.css("top", y + jWin.scrollTop());

        // if specified make callback and pass element
        if (opt.completeHandler)
            opt.completeHandler(this);
    });
}

function showOverlay(sec_name)
{
    $('#' + sec_name).show();
    $('#overlay').show();
    $('#overlayContent').show().centerInClient();
}

function hideOverlay()
{
    $('#overlayContent').hide();
    $('#overlay').hide();
    $('.overlay_content').hide();
}

function mouseOver(el)
{
    $(el).children().attr('src', 'images/know_more_btn_over.png');
}

function mouseOut(el)
{
    $(el).children().attr('src', 'images/know_more_btn.png');
}

$('<img>').attr('src', 'images/know_more_btn_over.png');