var trashAmount = 75;
if (document.getBoxObjectFor) {
    trashAmount = 20;
}

var text = "";
text += '<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" width="100%" height="100%" id="background">';
text += '<param name="movie" value="swf/vuilnisBack.swf" />';
text += '<param name="wmode" value="opaque" />';
text += '<param name="flashvars" value="trashAmount=' + trashAmount + '">';
text += '<!--[if !IE]>-->';
text += '<object type="application/x-shockwave-flash" data="swf/vuilnisBack.swf" width="100%" height="100%">';
text += '<param name="wmode" value="opaque" />';
text += '<param name="flashvars" value="trashAmount=' + trashAmount + '">';
text += '<!--<![endif]-->';
text += '<!-- alt content -->';
text += '<!--[if !IE]>-->';
text += '</object>';
text += '<!--<![endif]-->';
text += '</object>';
document.getElementById("container").getElementsByTagName("div").item(0).innerHTML = text;