function showHide( eleid ) {
  var el = document.getElementById(eleid);
  if ( el.style.display == "none" ) { 
    el.style.display = "block"
  } else {
    el.style.display = "none"
  };
};

function isalpha( str ) {
  accept="abcdefghijklmnoparstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890_";
  for( i=0; i<str.length; i++ ) {
    var c = str.substr(i,1);
    if ( accept.indexOf(c) == -1 ) {
      return false;
    };
  };
  return true;
};

function writeEmail(user,domain,clickable) {
  if ( clickable == 1 ) {
    document.write( "<a href='mailto:" + user + "@" + domain + "'>" );
  }
  document.write( user + "@" + domain );
  if ( clickable == 1 ) {
    document.write( "</a>" );
  }
}

function menujump(elename) {
  book = document.getElementById(elename+'name').value;
  if ( book != "" ) {
    document.getElementById(elename+'name').value = '';
    window.location = '/'+elename+'/'+book;
  };
};