document.observe("dom:loaded", function() {
  if( $('nav_fashion') ){
    var startSrc = $('nav_fashion').src;

    if( !startSrc.match(/\_on/) ) {
      $('nav_fashion').observe('mouseover', hoverNavImage);
      $('nav_fashion').observe('mouseout',  leaveNavImage);
    }
  }
  if( $('nav_promotional') ){
    var startSrc = $('nav_promotional').src;

    if( !startSrc.match(/\_on/) ) {
      $('nav_promotional').observe('mouseover', hoverNavImage);
      $('nav_promotional').observe('mouseout',  leaveNavImage);
    }
  }
  if( $('nav_search') ){
    var startSrc = $('nav_search').src;

    if( !startSrc.match(/\_on/) ) {
      $('nav_search').observe('mouseover', hoverNavImage);
      $('nav_search').observe('mouseout',  leaveNavImage);
    }
  }
});

function hoverNavImage(event) {
  imgId = Event.element(event).id;

  if( imgId && $(imgId) && $(imgId).src )
    $(imgId).src = '/images/' + imgId + "_on.jpg";
}
function leaveNavImage(event) {
  imgId = Event.element(event).id;

  if( imgId && $(imgId) && $(imgId).src )
    $(imgId).src = '/images/' + imgId + ".jpg";
}