function getObject(name) {
   var ns4 = (document.layers) ? true : false;
   var w3c = (document.getElementById) ? true : false;
   var ie4 = (document.all) ? true : false;

   if (ns4) return eval('document.' + name);
   if (w3c) return document.getElementById(name);
   if (ie4) return eval('document.all.' + name);
   return false;
}

function op(id) {
	var menu_items = Array('default', 'home', 'products', 'news', 'cars', 'support', 'shop', 'fun');
	for(i=0;i<menu_items.length;i++) {
		ob = getObject('menu_'+menu_items[i]);
		if(ob) ob.style.display = 'none';

		ob = getObject(menu_items[i]);
		if(ob) ob.className = '';
	}
	
	ob = getObject(id);
	if(ob) ob.className = 'current';
	
	ob = getObject('menu_'+id);
	if(ob) ob.style.display = 'block';

	var pos = '';
	switch(id) {
		case 'home':
			pos = '31';
			break;
		
		case 'products':
			pos = '111';
			break;
			
		case 'support':
			pos = '200';
			break;
			
			case 'news':
			pos = '281';
			break;
			

	}
	
	ob = getObject('sub-menu-holder');
	ob.style.backgroundPosition = pos+'px 0px';
}