function setupSideBar(){
    //var navleft = document.getElementById("nav-left");
    for(i = 0; i < navleft.childNodes.length; i++){
	navleft.childNodes[i].onmouseover = sideOn;
	navleft.childNodes[i].onmouseout = sideOff;
    }
}

function sideOn(e){
    highlightSide(e,true);
}

function sideOff(e){
    highlightSide(e,false);
}

function highlightSide(e,bOnOff){
    var target;
    var onoff= (bOnOff ? 1 : 0) + "$1";
    if(!e){
	e = window.event;
	target = e.srcElement;
    }else{
	target = e.target;
    }
    var pattern = /\d(\d)/;
    var source = target.getAttribute("src");
    if(source){ 
	var newstr = source.replace(pattern,onoff);
	target.setAttribute("src",newstr);
    }
}