_version=11;
		if (navigator.userAgent.indexOf('Mozilla/3') != -1)
		{_version=10;}
		
		var oas='http://oascentral.sciam.com/RealMedia/ads/';
		var sitepage = "physicsforums.com";
		var RN = new String (Math.random());
		var RNS = RN.substring (2, 11);
		
		function DisplayAds (position, width, height)
		{
		var oaspage= sitepage + '/1' + RNS + '@' + position;
		if (_version < 11) 
		{
			var temp_write = '<a href="' + oas + 'click_nx.cgi/'+ oaspage + '" target="_top" ><img src="' + oas + 'adstream_nx.cgi/' + oaspage + '" border="0" width="' + width + '" height="' + height + '"></a>';
			document.write (temp_write);
		} 
		else 
		{
			var temp_write = '<script language="JavaScript1.1" src="' + oas + 'adstream_jx.cgi/' + oaspage + '">';
		document.write (temp_write);
		document.write ('\<\!-- --\>');
		document.write ('\<\/SCRIPT\>');
		document.write ('\<\!-- --\>');
		}
		}