var d = document;

function unChekAll(what) {
	for (i = 0; i < d.getElementsByName(what).length; i++)
		d.getElementsByName(what)[i].checked = false;
}
function checkAll(what) {
	for (i = 0; i < d.getElementsByName(what).length; i++)
	 	d.getElementsByName(what)[i].checked = true;
}