/**
 * Clikc back to main page
 */
function mainpage()
{
  try {
    var link = document.getElementById( 'backToMain' )
  } catch ( e ) { return }
  link.onclick = function() {
    window.location.href = location.protocol +'//'+ location.hostname +':'+ location.port
  }
  link.onmouseover = function() {
    link.style.cursor = 'pointer'
  }
}
onload = mainpage