var ie=document.all&&navigator.userAgent.indexOf("Opera")==-1
var dom=document.getElementById&&navigator.userAgent.indexOf("Opera")==-1

var iframeprops='width=700 height=300 marginwidth="0" marginheight="0" hspace="0" vspace="0" frameborder="0" scrolling="no"'

var randomcontent=new Array()
randomcontent[0]="images/header_images/2.jpg"
randomcontent[1]="images/header_images/3.jpg"
randomcontent[2]="images/header_images/4.jpg"


if (ie||dom)
document.write('<iframe id="dynstuff" src="" '+iframeprops+'></iframe>')

function random_iframe(){
if (ie||dom){
var iframeobj=document.getElementById? document.getElementById("dynstuff") : document.all.dynstuff
iframeobj.src=randomcontent[Math.floor(Math.random()*randomcontent.length)]
}
}

window.onload=random_iframe