var num_rand	= Math.random();
	var num_seed	= Math.floor(num_rand*100);
	var num_number	= Math.floor(num_rand*10000); 

function AdSharing()
{
	if ((0 <= num_seed) && (num_seed <= 90)) { /* 90% for TribalFusion*/
		TribalFusionAd();
	}
	else if ((90 <= num_seed) && (num_seed <= 100)) { /* 10% for ScienceDaily */
		ScienceDailyAd();
	}
//	else if ((50 <= num_seed) && (num_seed <= 100)) { /* 50% for FastClick */
//		fastClick();
//	}
//		else if ((80 <= seed) && (seed <= 100)) { /* 20% for Discovery */
//		DiscoveryAd();
//	}
//	else if ((50 <= seed) && (seed <= 100)) { /* 50% for ScienceDaily */
//		ScienceDailyAd();
//	}
	
}     /*   close function AdSharing()    */

function TribalFusionAd() {
	document.write("<a href='http://a.tribalfusion.com/i.click?site=ScienceDailyMagazine&adSpace=ROS&requestID=" + num_number + "'>");
	document.write("<img src='http://a.tribalfusion.com/i.ad?site=ScienceDailyMagazine&adSpace=ROS&requestID=" + num_number + "' border=0 width=468 height=60></a>");
}

function fastClick() {
	document.write('<iframe src="http://media.fastclick.net/w/get.media?sid=8074&m=1&d=f&v=1.0c&t=n&pageid=1" width=468 height=60 hspace=0 vspace=0 frameborder=0 marginheight=0 marginwidth=0 scrolling=no><a href="http://media.fastclick.net/w/click.here?sid=8074&m=1&pageid=1" target="_blank"><img width=468 height=60 src="http://media.fastclick.net/w/get.media?sid=8074&m=1&d=s&v=1.0c&pageid=1" border=0></a></iframe>');
}

function ScienceDailyAd() {
	document.write('<iframe src="/ads/sciencedaily/scroller.htm" width=468 height=60 hspace=0 vspace=0 frameborder=0 marginheight=0 marginwidth=0 scrolling=no></iframe>');
}