function checkall() {
	var all = document.getElementById("all").value;
	if ( all == 'Y'){
		uncheckall();
		return;
	}else{
		var form = document.listForm;
		for (i=0; i < form.elements.length; i++) {
			if (form.elements[i].name =="ids[]") {
				form.elements[i].checked = true;
			}
		}
		document.listForm.all.value = "Y";
		return;
	}
}

function uncheckall() {
	var form = document.listForm;
	for (i=0; i < form.elements.length; i++) {
		if (form.elements[i].name =="ids[]") {
			form.elements[i].checked = false;
		}
	}
	document.listForm.all.value = "";
	return;
}