function getMaxHeight()
{
  if (document.getElementById('bildnavi'))
  {
    var start   = document.getElementById('bildnavi');
    var lis     = start.getElementsByTagName('li');
    var max     = new Array();
    var menue   = new Array();
    var counter = 0;
    var zaehler = 0;
    for (var i = 0; i < lis.length; i++)
    {
      if (i % 4 == 0)
      {
        menue[counter] = new Array();
        counter++;
        zaehler = 0;
      }
      menue[(counter - 1)][zaehler] = new Array('menue_' + (i + 1), lis[i].offsetHeight);
      zaehler++;
    }
    
    for (var i = 0; i < menue.length; i++)
    {
      for (var x = 0; x <menue[i].length; x++)
      {
        if (x == 0)
        {
          max[i] = menue[i][x][1];
        }
        else
        {
          if (menue[i][x][1] > menue[i][(x - 1)][1])
          {
            max[i] = menue[i][x][1];
          }
        }
      }
    }
    for (var i = 0; i < menue.length; i++)
    {
      for (var x = 0; x <menue[i].length; x++)
      {
        ele = menue[i][x][0];
        document.getElementById(ele).style.height = max[i] + 'px';
      }
    }
  }
}

window.onload = getMaxHeight();