var rolovat = false;

function rollRight() {      
  if ( rolovat != false ) {
    document.getElementById('show_f').scrollLeft = document.getElementById('show_f').scrollLeft + 5;
    setTimeout('rollRight("show_f")', 20);
  }
}

function rollLeft() {    
  if ( rolovat != false ) {
    document.getElementById('show_f').scrollLeft = document.getElementById('show_f').scrollLeft - 5;
    setTimeout('rollLeft("show_f")', 20);
  }
}

function rollStart() {
  rolovat = true;
}

function rollStop() {
  rolovat = false;
}


function display1(id){
  document.getElementById(id).style.display = 'block';
}
function display2(id){
  document.getElementById(id).style.display = 'none';
}

function slideShow(But1, But2) {
  document.getElementById(But1).style.background = 'none';
  document.getElementById(But1).style.borderBottom = '0px';
  document.getElementById(But2).style.background = '#E0E0E0';
  document.getElementById(But2).style.borderBottom = 'solid 1px black';
}