// an array storing swf
var swfArray = new Array ();
swfArray [0] = "banner.swf";
swfArray [1] = "banner2.swf";
swfArray [2] = "banner3.swf";
swfArray [3] = "banner4.swf";
swfArray [4] = "banner5.swf";
// random select a swf from the array
var selectedswf = Math.floor (Math.random () * swfArray.length);

function insert_flash_content ()
{
var elem = document.createElement ("embed");
elem.setAttribute ("src", swfArray [selectedswf]);
elem.setAttribute ("width", "737");
elem.setAttribute ("height", "181");

document.getElementById ("flash_content").appendChild (elem);
}