function backimg()
{
  if (document.layers)
  {
    var x,y;
    x=window.innerWidth/2-120;
    y=window.innerHeight/2-183;
    if (x>0)
      document.layers[0].left=x;
    if (y>0)
      document.layers[0].top=y;
    document.layers[0].visibility="show";
  }
  else if (document.all)
  {
    document.all.back.style.background="url('../bilder/back.jpg') fixed no-repeat center middle;";
  }
}

function flip(x)
{
  if (document.all)
  {
    document.all.cover.style.filter=(x==0?"":"flipV()");
  }
}

function showimg(url, w, h)
{
  w+=20; h+=20;
  window.open(url, "", "width="+w+",height="+h+",top=0,left=0,scrollbars=no");
}

function showurl(url, w, h)
{
  window.open(url, "", "width="+w+",height="+h+",top=0,left=0,scrollbars=yes");
}