//navo
function initnavo(){
	var nav = document.getElementById("navo");
	var navelets = nav.getElementsByTagName("a");
	for(var i=0; i<navelets.length; i++){
		navelets[i].onmouseover = function(){
			if(this.firstChild.src.indexOf("_off")>0){
				this.firstChild.src = this.firstChild.src.replace(new RegExp("_off\\b"), "_on");
			}
			else{
				this.firstChild.src = this.firstChild.src.replace(new RegExp("_on\\b"), "_off");
			}
		}
		navelets[i].onmouseout = function(){
			if(this.firstChild.src.indexOf("_off")>0){
				this.firstChild.src = this.firstChild.src.replace(new RegExp("_off\\b"), "_on");
			}
			else{
				this.firstChild.src = this.firstChild.src.replace(new RegExp("_on\\b"), "_off");
			}
		}
	}
}
addEvent(window, "load", initnavo);