function mark (el) {
	for (var i = 0; i < mark.arguments.length; ++i) {
		index = mark.arguments[i];
		document.getElementById("tevent"+index).className = "w_mark";
	}
}

function unmark (count) {
	for (var i = 0; i < count; ++i) 
		document.getElementById("tevent"+i).className = "w_unmark";
}