function zasednuti(elemnt,opac) {
		var opac1 = opac/10;
		var opac2 = opac*10;
		document.getElementById(elemnt).style.opacity=opac1;
		document.getElementById(elemnt).style.filter = 'alpha(opacity='+opac2+')';
	}
	function odstran_zasednuti(elemnt) {
		document.getElementById(elemnt).style.opacity=1;
		document.getElementById(elemnt).style.filter = 'alpha(opacity=100)';
	}