function simpleMenu(navid, orient, is_centered, menu_width)
{
	if(typeof document.getElementById == 'undefined' || /opera[\/ ][56]/i.test(navigator.userAgent)) { return; }
	this.iskde = navigator.vendor == 'KDE';
	this.isie = typeof document.all != 'undefined' && typeof window.opera == 'undefined' && !this.iskde;
	this.isoldsaf = navigator.vendor == 'Apple Computer, Inc.' && typeof XMLHttpRequest == 'undefined';
	this.tree = document.getElementById(navid);
	if(this.tree != null)
	{
		this.items = this.tree.getElementsByTagName('li');
		this.itemsLen = this.items.length;
		var i = 0; 
		do
		{
			this.init(this.items[i], this.isie, this.isoldsaf, this.iskde, navid, orient, is_centered, menu_width);
		}
		while (++i < this.itemsLen);
	}
}

simpleMenu.prototype.init = function(trigger, isie, isoldsaf, iskde, navid, ishoriz,is_centered, menu_width)
{
	trigger.menu = trigger.getElementsByTagName('ul').length > 0 ? trigger.getElementsByTagName('ul')[0] : null;
	trigger.link = trigger.getElementsByTagName('a')[0];
	trigger.issub = trigger.parentNode.id == navid;
	trigger.ishoriz = ishoriz == 'horizontal';
	this.openers = { 'm' : 'onmouseover', 'k' : (isie ? 'onactivate' : 'onfocus') };
	for(var i in this.openers)
	{
		trigger[this.openers[i]] = function(e)
		{
			if(!iskde) { trigger.link.className += (trigger.link.className == '' ? '' : ' ') + 'rollover'; }
			if(trigger.menu != null)
			{
				if(trigger.ishoriz) 
				{ 
					if (is_centered && isie) {
					//alert("ddd");
						correctedX = (screen.width - 20) / 2  - (menu_width / 2);
						trigger.menu.style.left =  correctedX + trigger.offsetLeft + 'px'; 
					} else {
						trigger.menu.style.left = (isie || isoldsaf) ? trigger.offsetLeft + 'px' : 'auto'; 
					}
				}
				if (!is_centered) {
					trigger.menu.style.top = 50+(trigger.ishoriz && trigger.issub) ? (isie || (trigger.ishoriz && isoldsaf)) ? trigger.link.offsetHeight + 'px' : 'auto' : (isie || (trigger.ishoriz && isoldsaf)) ? trigger.offsetTop + 'px' : '0';
				}
			
			}
		};
	}
	this.closers = { 'm' : 'onmouseout', 'k' : (isie ? 'ondeactivate' : 'onblur') };
	for(i in this.closers)
	{
		trigger[this.closers[i]] = function(e)
		{
			this.related = (!e) ? window.event.toElement : e.relatedTarget;
			if(!this.contains(this.related))
			{
				if(!iskde) { trigger.link.className = trigger.link.className.replace(/[ ]?rollover/g, ''); }
				if(trigger.menu != null)
				{
					trigger.menu.style[(trigger.ishoriz ? 'left' : 'top')] = trigger.ishoriz ? '-10000px' : '-100em';
				}
			}
		};
	}
	if(!isie)
	{
		trigger.contains = function(node)
		{
			if (node == null) { return false; }
			if (node == this) { return true; }
			else { return this.contains(node.parentNode); }
		};
	}
}