function chooseBanner() {
	var numbanners=2;
	switch (rndnum(numbanners-1)) {
		case 0: document.getElementById("banner").src="ads/tc_banner.html"
		case 1:	document.getElementById("banner").src="http://www.pay4foss.org/jumpstation/chatstar/cs_banner.html"
	}
}

// returns a random number between 0 and 'limit' (including 0 and limit)
if (!rndnum) {
rndnum=function (limit) {
	return(Math.round((Math.random()*limit)));}
}