var randomnumber;
		var x;
		var books;
		
		books = 2;
		
		randomnumber = Math.floor(Math.random() * books);
		randomnumber = randomnumber + 1;
		
		switch(randomnumber)
			{
			case 1:
				document.write('<a href="http://www.midatlanticmultisport.com/" target="_blank"><img src="http://www.trifind.net/b/mid-atlantic/side.gif"');
				document.write(' border="0"');
				document.write(' alt="triathlon boot camp"></a>');
				break;
			case 2:
				document.write('<a href="http://www.midatlanticmultisport.com/" target="_blank"><img src="http://www.trifind.net/b/mid-atlantic/side.gif"');
				document.write(' border="0"');
				document.write(' alt="triathlon training"></a>');
				break;
			case 3:
				document.write('<br><br><iframe src="http://www.trifind.net/b/earth-studio/side/1.html" width=130 height=160 frameborder=0 scrolling=no marginwidth=0 marginheight=0></iframe>');
				break;
			case 4:
				document.write('<iframe src="http://www.trifind.net/b/trinity-designs/side/2.html" width=124 height=160 frameborder=0 scrolling=no marginwidth=0 marginheight=0></iframe>');
				break;
			}