isDOM = document.getElementById; 
isMN = navigator.appName == "Netscape"; 
var h = 0, s = 0, t = 0, str = "", m = 0; 
if (isMN) { 
	var str = "px;"; 
	var m = 0; 
} 

function opfScroll() { 
	if (isDOM) h = document.body.clientHeight; 
	else h = document.body.innerHeight; 
	
	if (isMN) s = pageYOffset; 
	else s = document.body.scrollTop; 
	
	if (s == 0) s = document.documentElement.scrollTop; 
	
	t = h + s - m - document.getElementById("opf").offsetHeight; 
	document.getElementById("opf").style.top = t + str; 
} 

function opfBanner() {
	document.write('<div id="opf"><a href="http://www.onepagefree.com/ad.php?s=&amp;t=2" class="blank" title="Powered by OnePageFree.com"><img src="http://www.onepagefree.com/images/banners/opf_sm.jpg?s=&amp;t=2" alt="Powered by OnePageFree.com" /></a></div>');
	setInterval('opfScroll();', 10); 
}