jq(document).ready(function() { 

    // overlay needs target object prior to initialization...
    if (jq(".rundgang").length != 0) {
        jq("#content").after('<div class="simple_overlay" id="rundgang_iframe"></div>');    
    };

    jq(".rundgang").attr("rel", "#rundgang_iframe");
    jq(".rundgang").overlay({
        fixed: false,
        top: "5%",
        onBeforeLoad: function() {
            // ...but injects heavy iframe as late as possible
            jq("#rundgang_iframe").append('<iframe src="http://rundgang.gottorf.extern.catworkx.de" width="960" height="720"></iframe>');
        },
    });
});