function getActiveStyleSheet() 
  {
    var i, a;
    for(i=0; (a = document.getElementsByTagName("link")[i]); i++) 
    {
      if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled)
        return a.getAttribute("title");
    }
    return null;
  }
  function setActiveStyleSheet(title) 
  {
    var i, a, main;
    for(i=0; (a = document.getElementsByTagName("link")[i]); i++)
    {
      if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) 
      {
         a.disabled = true;
         if(a.getAttribute("title") == title) a.disabled = false;
       }
     }
  }
  function policeMoins()
  {
    var title = getActiveStyleSheet();
    switch(title)
    {
      case 'normal':;break;
      case 'large':
          document.getElementById('amoins').src = "/picts/v2/picto/amoinsoff.gif";
          setActiveStyleSheet('normal');
          break;
      case 'xxlarge':
          document.getElementById('aplus').src = "/picts/v2/picto/aplus.gif";
					setActiveStyleSheet('large') ;break;
    }
  }
  function policePlus()
  {
    var title = getActiveStyleSheet();
    switch(title)
    {
      case 'normal':
          document.getElementById('amoins').src = "/picts/v2/picto/amoins.gif";
					setActiveStyleSheet('large');
					break;
      case 'large':
          document.getElementById('aplus').src = "/picts/v2/picto/aplusoff.gif";
          setActiveStyleSheet('xxlarge');
          break;
      case 'xxlarge':;break;
    }
  }