Base.addInitFunction(function(){
  var resetro = (/Konqueror|Safari|KHTML/.test(navigator.userAgent)) ?
    function() {
      Element.setStyle('navihilite',{'clip': 'rect(0px, 0px, 0px, 0px)'});
      Element.hide('navihilite');
    }
    :
    function(){
      Element.setStyle('navihilite',{'clip': 'rect(0px, 0px, 0px, 0px)'});
    };

  var nh = $('navihilite');
  $$('map#navimap area').each(function(a){
    var c = $A(a.coords.split(','));
    a.onmouseover=function(){
      Element.setStyle(nh,{'clip': a.shape+'('+c[1]+'px, '+c[2]+'px, '+c[3]+'px, '+c[0]+'px)'});
      Element.show('navihilite');
    };
    a.onmouseout=resetro;
  });
  resetro();
  Element.show('navihilite');
});

Base.addExitFunction(function(){
  Element.hide('navihilite');
  $$('map#navimap area').each(function(a){
    a.onmouseover=function(){};
    a.onmouseout=function(){};
  });
});