var els = document.getElementById('advert-left').getElementsByTagName('*');
for (var i=0; i<els.length; i++) {
	var id_pcs = els[i].id.split('-');
	if (id_pcs[0]!='advert') continue;
	
	els[i].onclick = function (ev) {
	   document.location = 'http://adv.pgweb.cz/click.php?adv='+this.id.split('-')[1];
	   return false;
	};
};