var timer = 0;
var drop_down = "";

var all_drop_down_menu_ids = new Array();


function show_drop_down(menu_id) {
	var old_drop_down_value = drop_down;
	drop_down = document.getElementById("sub_menu_" + menu_id);

	if (!drop_down) {
		drop_down = old_drop_down_value;
		return false;
	}

	var num_drop_down_menus = all_drop_down_menu_ids.length;
	for (i = 0; i < num_drop_down_menus; i++) {
		if (menu_id != all_drop_down_menu_ids[i]) {
			var other_drop_down = document.getElementById("sub_menu_" + all_drop_down_menu_ids[i]);
			if (other_drop_down)
				other_drop_down.style.visibility = 'hidden';
		}
	}

	drop_down.style.left = getMenuX("menu_" + menu_id) + "px";
	drop_down.style.top = getMenuY("menu_" + menu_id) + "px";
	drop_down.style.visibility = 'visible';

	clearTimeout(timer);
}

function hide_drop_down(menu_id) {
	var old_drop_down_value = drop_down;

	drop_down = document.getElementById("sub_menu_" + menu_id);
	if (!drop_down) {
		drop_down = old_drop_down_value;
		return false;
	}

	timer = setTimeout("if (drop_down) drop_down.style.visibility = 'hidden';", 800);
}

function getMenuX(element_id){
	var xPos = document.getElementById(element_id).offsetLeft;
	var tempEl = document.getElementById(element_id).offsetParent;

	while (tempEl != null) {
		xPos += tempEl.offsetLeft;
		tempEl = tempEl.offsetParent;
	}

	//xPos += 18;

	return xPos;
}

function getMenuY(element_id) {
	var yPos = document.getElementById(element_id).offsetTop;
	var tempEl = document.getElementById(element_id).offsetParent;

	while (tempEl != null) {
		yPos += tempEl.offsetTop;
		tempEl = tempEl.offsetParent;
	}

	yPos += 43;

	return yPos;
}