function createOverlayPage(source) {
    $('#overlay').prepend('<div id="tframe"><iframe class="" type="text/html" width="590" frameborder="0" src="' + source + '" onload="setframeheight()" scrolling="no" name="contentFrame" id="contentFrame"></iframe></div>');
};
function setframeheight() {
    var f = document.getElementById('contentFrame');
    f.style.height = f.contentWindow.document.body.scrollHeight + "px";
};

$(document).ready(function () {
    var maskColor = '#4c4c4c';
    $('a.overlayIframe[rel]').overlay({
        mask: maskColor,
        onClose: function () {
            $('#tframe').remove();
        }
    });

});