function echeck(str) {

  var at="@"
  var dot="."
  var lat=str.indexOf(at)
  var lstr=str.length
  var ldot=str.indexOf(dot)
  if (str.indexOf(at)==-1){
    return false
  }

  if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
    return false
  }
  if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
    return false
  }
  if (str.indexOf(at,(lat+1))!=-1){
    return false
  }
  if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
    return false
  }
  if (str.indexOf(dot,(lat+2))==-1){
    return false
  }
  if (str.indexOf(" ")!=-1){
    return false
  }
  return true					
}


function openWin(adr, w, h) {
  l=(screen.width - w)/2;
  t=(screen.height - h)/2;
		
  parameter = "toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=1,width="+w+",height="+h+",left="+l+",top="+t+"";
  win=window.open(adr,"Foto",parameter);
}

function musica_on() {
  var url = 'musica_on.php';
  var target = 'L_MUSICA';
  var pars = '';
  /* Old script using prototype 
          var myAjax = new Ajax.Updater(target, url, {method: 'get', parameters: pars});
   */
  /* New Ajax call using jQuery */
  $.ajax({
    url: 'musica_on.php',
    success: function(data) {
      $('#L_MUSICA').html(data);
    }
  }); 
}

function musica_off() {
  
  /* Old script using prototype 
  var url = 'musica_off.php';
  var target = 'L_MUSICA';
  var pars = '';
   
  var myAjax = new Ajax.Updater(target, url, {
    method: 'get', 
    parameters: pars
  }); 
   */
  /* New Ajax call using jQuery */
  $.ajax({
    url: 'musica_off.php',
    success: function(data) {
      $('#L_MUSICA').html(data);
    }
  }); 
}


var actFoto = 0;

function showNext(max) {
  $('#foto'+parent.actFoto).css('opacity', '0');
  parent.actFoto += 1;
  if (parent.actFoto > max) {
    parent.actFoto = 1;
  }        
  $('#foto'+this.actFoto).css('opacity', '1');
}

function showFoto(nr) {
  var old = parent.actFoto;
  $('#foto'+old).css('opacity', '0');
  $('#foto-button'+old).removeClass('foto-active');
  $('#foto'+nr).css('opacity', '1');
  $('#foto-button'+nr).addClass('foto-active');
  parent.actFoto = nr;
}