var HOME         = 0;
var TAETIGKEITEN = 1;
var PROFIL       = 2;
var KONTAKT      = 3;

var MAX_PAGES    = 4;           // Anzahl der Seiten.


var PAGE_NUM     = HOME;
var INITED       = false;
var MUL_OFF      = 0;
var MUL_HOVER    = 1;
//var MUL_ON       = 2;

var IMAGES = new Array ( MAX_PAGES * 2 );

var INAMES = new Array ( "img/spacer.gif",
                         "img/menu-home-hover.jpg",
                         //"img/menu-home-on.jpg",
                         "img/spacer.gif",
                         "img/menu-taetigkeiten-hover.jpg",
                         //"img/menu-taetigkeiten-on.jpg",
                         "img/spacer.gif",
                         "img/menu-profil-hover.jpg",
                         //"img/menu-profil-on.jpg",
                         "img/spacer.gif",
                         "img/menu-kontakt-hover.jpg"
                         //"img/menu-kontakt-on.jpg"
                        );

var NPP = INAMES.length / MAX_PAGES;

function setPageNo ( num ) {
  PAGE_NUM = num;
  var iarr = 0;
  for ( var i = 0; i < MAX_PAGES; ++i ) {
    if ( i != PAGE_NUM ) {
      IMAGES[iarr] = new Image();
      IMAGES[iarr].src = INAMES[ i + MUL_OFF   ];    ++iarr;
      IMAGES[iarr] = new Image();
      IMAGES[iarr].src = INAMES[ i + MUL_HOVER ];    ++iarr;
      // IMAGES[iarr] = new Image();
      // IMAGES[iarr].src = INAMES[ i + MUL_ON    ];    ++iarr;
    }
  }
  INITED = true;
}


function onMenuOut      ( who, num )
{
  if ( ! INITED ) window.status =  "Bild nicht vorgeladen:" + INAMES[ (num * NPP) + MUL_OFF ];
  if ( num == PAGE_NUM ) return;
  who.style["backgroundImage"] = "url(" + INAMES[ (num * NPP) + MUL_OFF ] + ")";
}



function onMenuOver     ( who, num )
{
  if ( ! INITED )
    window.status =  "Bild nicht vorgeladen:" + INAMES[ (num * NPP) + MUL_HOVER ];
  if ( num == PAGE_NUM ) return;
  who.style["backgroundImage"] = "url(" + INAMES[ (num * NPP) + MUL_HOVER ] + ")";

}