sfHover = function()
{
  var sfEls = document.getElementById("menu").getElementsByTagName("li");
  for (var i=0; i<sfEls.length; i++)
  {
    sfEls[i].onmouseover=function()
    {
      this.className+=" hover";
    }
    sfEls[i].onmouseout=function()
    {
      this.className=this.className.replace(new RegExp(" hover\\b"), "");
    }
  }
}
  
function myOn(myImgName)
{
  document.getElementById(myImgName).src=eval(myImgName+ 'H' ).src;
}
  
function myOut(myImgName)
{
  document.getElementById(myImgName).src=eval(myImgName+ 'N' ).src;
}