function ge(e){ return document.getElementById(e); }

function loadnav(){
	var ni = ge('nav').getElementsByTagName('img');
	for (var i = ni.length - 1; i >= 0; i--){
		ni[i].onmouseover = function(){this.src=this.src.replace('.gif','2.gif');};
		ni[i].onmouseout = function(){this.src=this.src.replace('2.gif','.gif');};
	};
}