if ($('#'+targetID).find("iframe").width() != 640) {
    var nativeWidth = 500;
    var nativeHeight = $('#'+targetID).find("iframe").height();
    var ratio = nativeWidth/nativeHeight;
    var ifvheight = $('#'+targetID).find("iframe").attr("height");
    var newHeight = 640/ratio;
    $('#'+targetID).find("iframe").height(newHeight);
    $('#'+targetID).find("iframe").width(640);
    $('#'+targetID).find("iframe").height($('#'+targetID).find("iframe").height() - 100);
}