dropdown = function()
{
	var sfEls = document.getElementById('nav').getElementsByTagName('LI');
	for (var i=0; i<sfEls.length; i++)
	{
		sfEls[i].onmouseover=function()
		{
			this.className += ' dropdown';
		}
		sfEls[i].onmouseout = function()
		{
			this.className = this.className.replace(new RegExp(' dropdown\\b'),'');
		}
	}
}
if (window.attachEvent) window.attachEvent('onload', dropdown);