function popupQuiz(siteid) {

	var width=520,height=370;
	var left=(((screen.availWidth / 2 ) - (width / 2)) -12);
	var top=((screen.availHeight / 2 ) - (height / 2));
  	navigator.appName.indexOf("netscape") ? r=0 : r=1;
	var features='width='+width+',height='+height+',left='+left+',top='+top+'resizeable='+r;
	var domain = self.location.hostname;
	
	switch(siteid){
		case 1: var url = 'http://tracker.tradedoubler.com/click?a=672164&p=221&PARAM2=http://www.soyouthinkyouknowitall.com&PARAM4=1'; break;
		case 2: var url = 'http://tracker.tradedoubler.com/click?a=672164&p=221&PARAM2=http://www.soyouthinkyouknowfootball.com&PARAM4=1'; break;
		case 3: var url = 'http://tracker.tradedoubler.com/click?a=672164&p=221&PARAM2=http://www.soyouthinkyouknowmusic.com&PARAM4=1'; break;
		case 4: var url = 'http://tracker.tradedoubler.com/click?a=672164&p=221&PARAM2=http://www.soyouthinkyouknowf1.com&PARAM4=1'; break;
		case 5: var url = 'http://tracker.tradedoubler.com/click?a=672164&p=221&PARAM2=http://www.soyouthinkyouknowsport.com&PARAM4=1'; break;
		case 6: var url = 'http://tracker.tradedoubler.com/click?a=672164&p=221&PARAM2=http://www.soyouthinkyouknowfilms.com&PARAM4=1'; break;		
		case 7: var url = 'http://tracker.tradedoubler.com/click?a=672164&p=221&PARAM2=http://www.soyouthinkyouknowrugby.com&PARAM4=1'; break;		
		case 8: var url = 'http://tracker.tradedoubler.com/click?a=672164&p=221&PARAM2=http://www.soyouthinkyouknowgolf.com&PARAM4=1'; break;		
		case 9: var url = 'http://tracker.tradedoubler.com/click?a=672164&p=221&PARAM2=http://www.soyouthinkyouknowcricket.com&PARAM4=1'; break;
		case 16: var url = 'http://tracker.tradedoubler.com/click?a=672164&p=221&PARAM2=http://www.soyouthinkyouknowhorseracing.com&PARAM4=1'; break;		
		case 17: var url = 'http://tracker.tradedoubler.com/click?a=672164&p=221&PARAM2=http://rugbyleague.soyouthink.com&PARAM4=1'; break;		
		case 19: var url = 'http://tracker.tradedoubler.com/click?a=672164&p=221&PARAM2=http://tennis.soyouthink.com&PARAM4=1'; break;		
		default: var url = 'http://tracker.tradedoubler.com/click?a=672164&p=221&PARAM2=http://www.soyouthinkyouknowitall.com&PARAM4=1'; break;
	}

	url += '&domain='+escape(domain);
	var activeWindow=window.open(url,'quiz_window',features);
}