function when(anObject, anEvent, takeAction){
    if(anObject.attachEvent)
        anObject.attachEvent("on"+anEvent,takeAction);
    else if(anObject.addEventListener)
        anObject.addEventListener(anEvent,takeAction,true);
}

function highlight(anIndex) {
    document.getElementById('NavBarHiLite').getElementsByTagName('li')[anIndex].className='navOn';
}

function navHighlight(){
    var navImages = document.getElementById('NavBar').getElementsByTagName('img');
    for(aCount=0;aCount<navImages.length;aCount++){
        if(navImages[aCount].className=='navItemOn'){
            highlight(aCount);
        }
    }
}

when(window, "load", navHighlight);