function sfhover()
{
var quantidade_menus=2;
for (var x=1; x <= quantidade_menus; x++)
	{
	if (x == 1)
		{
		var sfEls = document.getElementById("nav").getElementsByTagName("LI");
		}
	else
		{
		var sfEls = document.getElementById("nav"+x).getElementsByTagName("LI");
		}

	for (var i=0; i < sfEls.length; i++)
		{
		sfEls[i].onmouseover=function()
			{
			this.className+=" sfhover";
			}

		sfEls[i].onmouseout=function()
			{
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
			}
		}
	}
}