var isLoaded = false

function preload(srcList) {
  if (document.images) {
    var j = 0;
    for (i = 0; i <= (srcList.length / 2); i++) {
      eval(srcList[j]+' = new Image()')
      eval(srcList[j]+'.src = "'+srcList[++j]+'"')
      j++
    }
    isLoaded = true
  }
}

function changeImage(layer,imgName,imgObj) {
  if (document.images) {
    if (isLoaded) {
      if (document.layers && layer!=null) eval('document.'+layer+'.document.images["'+imgName+'"].src = '+imgObj+'.src')
      else document.images[imgName].src = eval(imgObj+".src")
    }
  }
}

function m_over(menuid) {
  items = (imageArr.length / 4)
  for (var i=0; i<items; i++) {
    changeImage(null,imageArr[i*4],imageArr[i*4]);
  }
  changeImage(null,'menu'+menuid,'menu'+menuid+'_over');
}

function m_out(menuid) {
  changeImage(null,'menu'+menuid,'menu'+menuid);
}