var checked = new Array();
var oldBgColor;

function OznacItem(id) {
	if(!checked[id]){
		document.getElementById(id).checked = 'checked';
		oldBgColor = document.getElementById(id).parentNode.parentNode.style.backgroundColor;
		document.getElementById(id).parentNode.parentNode.style.backgroundColor = '#666';
		checked[id] = true;
	}
	else {
		document.getElementById(id).checked = '';
		document.getElementById(id).parentNode.parentNode.style.backgroundColor = oldBgColor;
		checked[id] = false;
	}
}