sfHover = function()
{
	var sfEls = document.getElementById('main_nav').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"), "");
		}
	}
}

if (window.attachEvent)
{
	window.attachEvent('onload', sfHover);
}