function deca(id_div) {
	if (id_div != '') action_div(id_div);
}
function action_div(id_div) {
	var item = null;
	if (document.getElementById) {
		item = document.getElementById(id_div);
	} else if (document.all){
		item = document.all[id_div];
	} else if (document.layers){
		item = document.layers[id_div];
	}

	if (!item) {
	} else if (item.style) {
		if (item.style.display == "none") {
			item.style.display = "";
		} else {
			item.style.display = "none";
		}
	} else {
		item.visibility = "show";
	}
}