check = false;

function setOrszagok() {

	if (check == false) {
		selectAll();
		check = true;
	} else {
		deselectAll();
		check = false;
	}

}

function selectAll() {
d = document.forms['a'];
	for (i = 0; i < d.elements.length; i++) {
		if (d.elements[i].type == "checkbox") {
			if (d.elements[i].name.substr(0,1) == "s") {
				d.elements[i].checked = true;
			}
		}
	}
}

function deselectAll() {
d = document.forms['a'];
	for (i = 0; i < d.elements.length; i++) {
		if (d.elements[i].type == "checkbox") {
			if (d.elements[i].name.substr(0,1) == "s") {
				d.elements[i].checked = false;
			}
		}
	}
}