var checkall = false;
function Check() {
	var chk = document.Check_Form;
	if (checkall == true) checkall = false;
	else checkall = true;

	if (checkall == true) {
		for (var i = 0; i < chk.elements.length; i++) {
			if (chk.elements[i].type == "checkbox" && chk.elements[i].checked == false) {
				chk.elements[i].checked = true;
			}
		}
	}
	else {
		for (var i = 0; i < chk.elements.length; i++) {
			if (chk.elements[i].type == "checkbox" && chk.elements[i].checked == true) {
				chk.elements[i].checked = false;
			}
		}
	}
}

function Choice_Check() {
	var chk = document.Check_Form;
	var checked;
	for (var i = 0; i < chk.elements.length; i++) {
		if (chk.elements[i].type == "checkbox" && chk.elements[i].checked == true) {
			checked = true;
		}
	}
	if (checked == true) return true;
	else {
        alert( "»èÁ¦ÇÏ°íÀÚÇÏ´Â ¸®½ºÆ®¸¦ ¼±ÅÃÇØ ÁֽʽÿÀ." );
		return false;
	}
}