var tiernummer=0;

function tierSelect(tiernummer,countertier) {
	if(tiernummer==0) {
		document.images['imgButtonTier1'].src='images/blank.gif';
		document.images['imgButtonTier2'].src='images/blank.gif';
		document.images['imgButtonTier3'].src='images/blank.gif';
		document.images['imgButtonTier4'].src='images/blank.gif';
		document.images['imgButtonTier'+countertier].src='images/buttonTier' + countertier + '.jpg';
		
		countertier=countertier+1;
		if(countertier==5) {countertier=1;}
		buttons = window.setTimeout("tierSelect(0," + countertier + ");",500);
		}
	else	{
		window.clearTimeout(buttons);
		document.images['imgButtonTier1'].src='images/blank.gif';
		document.images['imgButtonTier2'].src='images/blank.gif';
		document.images['imgButtonTier3'].src='images/blank.gif';
		document.images['imgButtonTier4'].src='images/blank.gif';
		document.images['imgButtonTier'+tiernummer].src='images/buttonTier' + tiernummer + '.jpg';
	}
}

buttons = window.setTimeout("tierSelect(0,1);",500);