function mouseOver()
{
 if(document.getElementById('listeThemes')){obj = document.getElementById('listeThemes'); classBase = 'listeThemes';} 
 if(document.getElementById('listeHistoFocus')){obj = document.getElementById('listeHistoFocus'); classBase = 'listeHistoFocus';}
 if(document.getElementById('listeHistoActus')){obj = document.getElementById('listeHistoActus'); classBase = 'listeHistoActus';}
 classHover = classBase + 'Hover';
 
 LiS = obj.getElementsByTagName('li');
 for(i=0; i<LiS.length; i++)
 {
  if(!LiS[i].className)
  {
   LiS[i].onmouseover = function(){this.className = classHover;};
   LiS[i].onmouseout  = function(){this.className = classBase;};
  }
 }
}

window.onload = function (){mouseOver();}