function horizontal()
	{
		var navItems = document.getElementById("menu_dropdown").getElementsByTagName("li");
		for (var i=0; i< navItems.length; i++)
			{
				if(navItems[i].className == "submenu")
					{
						if(navItems[i].getElementsByTagName('ul')[0] != null)
							{
								navItems[i].onmouseover=function()
									{
										this.getElementsByTagName('ul')[0].style.display="block";
										this.style.backgroundColor = "#f9f9f9";
									}
								navItems[i].onmouseout=function()
									{
										this.getElementsByTagName('ul')[0].style.display="none";
										this.style.backgroundColor = "#FFFFFF";
									}
							}
					}
			}
	}