var adv_divId = "myDiv";
var adv_link = "http://photosynth.net/embed.aspx?cid=";
var adv_width = 750;
var adv_height = 540;

fillIFrame = function() {
    if (document.getElementById(adv_divId) != null && adv_link != null) {
        var newIFrame = document.createElement('iframe');
        newIFrame.setAttribute('id', 'my' + adv_divId + '_IFrame');
        newIFrame.setAttribute('src', adv_link + document.body.id);
        if (adv_width != null && !isNaN(adv_width)) {
            newIFrame.setAttribute('width', adv_width);
        }
        if (adv_height != null && !isNaN(adv_height)) {
            newIFrame.setAttribute('height', adv_height);
        }

        document.getElementById(adv_divId).appendChild(newIFrame);
    }
}

window.attachEvent("onload", fillIFrame);