// Script by Raphaël Mazoyer (raf@phase4.net).
// Please quote source if you want to use it.
// http://web.phase4.net/
// Version 1.01 - 15/09/99

// The square at (7,3) must be named "img-73", and must launch action "hop('73')".

// Number of lines in the game (must be 9 or under) :

nx = 5;

// Number of columns in the game (must be 9 or under) :

ny = 4;

// Path and name of the transparent file :

tr = 'bilder/puzzel/clear.gif';

// Path and name of the missing image file :

bo = 'bilder/puzzel/4b.jpg';

// End of configuration variables.


var canStart = false;
var hasStarted = false;
pos = new Array(); // Position array, initialized from original image position.
ind = new Array(); // Indexed array, used to shuffle the images.
rnd = new Array(); // Randomized array, used to display the images when beginning a game.

function hop(which) {
  if (hasStarted == true) {
    x = which.charAt(0);
    y = which.charAt(1);
    var tx = 0;
    var ty = 0;
    for (var i = 1; i <= nx; i++) {
      for (var j = 1; j <= ny; j++) {
        if (document.images['img-' + i.toString() + j.toString()].src.indexOf(tr) != -1) {
          if((i + 1 == x && j == y) || (i - 1 == x && j == y) || (j + 1 == y && i == x) || (j - 1 == y && i == x)) {
            tx = i;
            ty = j;
          }
        }
      }
    }
    if(tx != 0 && ty != 0) {
      document.images['img-' + tx.toString() + ty.toString()].src = document.images['img-' + which].src;
      document.images['img-' + which].src = tr;
      checkPositions(which);
    }
    else
      alert('Auf ein Puzzle-Stück neben\ndem freien Feld klicken');
  }
  else {
    randomizePositions();
  }
}

function randomizePositions() {
  if (canStart == true) {
    hasStarted = true;
    for (var i = 1; i <= nx; i++) {
      for (var j = 1; j <= ny; j++) {
        var rm = i.toString() + j.toString();
        while (rnd[rm] == null) {
          var rn = Math.round(Math.random()*(ind.length - 1));
          if (ind[rn] != null) {
            rnd[rm] = ind[rn];
            ind[rn] = null;
          }
        }
      }
    }
    for (var i = 1; i <= nx; i++) {
      for (var j = 1; j <= ny; j++) {
        var rm = i.toString() + j.toString();
        document.images['img-' + rm].src = rnd[rm];
      }
    }
    ind = new Array();
    rnd = new Array();
    for (var i = 1; i <= nx; i++) {
      for (var j = 1; j <= ny; j++) {
        var rm = i.toString() + j.toString();
        ind[ind.length] = pos[rm];
      }
    }
    document.controlpanel.startbutton.value = "Neu mischen";
  }
  else {
    alert('Bitte warten bis die Seite\nkomplett geladen ist.');
  }
}

function checkPositions(which) {
  var wrong = false;
  for (var i = 1; i <= nx; i++) {
    for (var j = 1; j <= ny; j++) {
      var rm = i.toString() + j.toString();
      if(document.images['img-' + rm].src != pos[rm])
        wrong = true;
    }
  }
  if (wrong == false) {
    document.images['img-' + which].src = bo;
    document.controlpanel.startbutton.value = 'Sie haben gewonnen!';
    if(confirm('Sie haben gewonnen!\nBitte merken Sie sich den Überraschungs-Code\nund tragen Sie ihn bei der Buchung mit ein.\nWollen Sie nochmal?')) {
      document.images['img-' + which].src = tr;
      randomizePositions();
    }
    document.controlpanel.startbutton.value = 'Neu starten';
  }
}

function startGame() {
  if (document.images) {
    bonusImage = new Image();
    bonusImage.src = bo;
    for (var i = 1; i <= nx; i++) {
      for (var j = 1; j <= ny; j++) {
        var rm = i.toString() + j.toString();
        pos[rm] = document.images['img-' + rm].src;
        ind[ind.length] = pos[rm];
      }
    }
    document.controlpanel.startbutton.value = "Start";
    canStart = true;
  }
  else {
    alert('Sie können dieses Puzzle nicht spielen,\nda Javascript benötigt wird.\n\nBitte holen Sie sich eine aktuelle\nVersion ihres Browsers.');
    location.href="http://www.microsoft.com/windows/ie/download/all.htm";
  }
}