function loadImages()
{
  if( document.images )
  {
    b1_off = new Image(); b1_off.src = "images/b1.gif"
    b1_over = new Image(); b1_over.src = "images/b1_over.gif"
    b2_off = new Image(); b2_off.src = "images/b2.gif"
    b2_over = new Image(); b2_over.src = "images/b2_over.gif"
    b3_off = new Image(); b3_off.src = "images/b3.gif"
    b3_over = new Image(); b3_over.src = "images/b3_over.gif"
    b4_off = new Image(); b4_off.src = "images/b4.gif"
    b4_over = new Image(); b4_over.src = "images/b4_over.gif"
    b5_off = new Image(); b5_off.src = "images/b5.gif"
    b5_over = new Image(); b5_over.src = "images/b5_over.gif"
  }
}

function rollover( ImageName, over )
{
  if( document.images != null )
  {
    if( over )
      document[ImageName].src = eval( ImageName + "_over.src" );
    else
      document[ImageName].src = eval( ImageName + "_off.src" );
  }
}