var how_many_ads = 3;
		var now = new Date()
		var sec = now.getSeconds()
		var ad = sec % how_many_ads;
		var banner = "../images/banner/banner_new_lib.gif";
		var width="468";
		var height="60";
		var alt="";
		var url="";
		
		ad +=1;
		if (ad==1) {
		
		url="index.html";
		
		alt="CWGC Library Web Site";
		banner="../images/banner/banner_new_lib.gif";

		}
		if (ad==2) {
		
		url="reading_scheme.html";
		
		alt="Reading Scheme";
		banner="../images/banner/banner_reading_scheme.gif";
		}
		if (ad==3) {

		url="http://www.rthk.org.hk/elearning/1minreading/";
		
		alt="e-learning 1 minutes";
		banner="../images/banner/banner_rthk.gif";
		}	
		
		
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