function CommImgOver()
{
  var LImg = document.getElementById( "comm_img" );
  if( !LImg ) 
    return;
  LImg.src = "http://www.sm-vaspitac.edu.rs/wp-content/themes/onepenny/img_on.jpg";
}

function CommImgOut()
{
  var LImg = document.getElementById( "comm_img" );
  if( !LImg ) 
    return;
  LImg.src = "http://www.sm-vaspitac.edu.rs/wp-content/themes/onepenny/img_off.jpg"; 
}