#logo_header {
  width:800px;
  height:293px;
  background-color:#1f1a17 ; 
  margin: 80px auto 50px auto;
/*url('/boisie.gif') 50% 50% no-repeat; */
}
img {
  border:none;
}
a {
  text-decoration:none;
}
#logo_header a {
  display:block;
}
#otwarte {
  cursor:help;
}
#main {
  color:black;
  width:800px;
  background-color:#aaa;
  margin:10px auto;
  padding:0;
}
#menu {
  width:640px;
  margin:20px auto;
  padding:0;
}
#menu li {
  margin:0;
  padding:0;
  height:50px;
  width:200px;
  overflow:hidden;
  float:left;
}
#menu img {
  border: none;
}
#menu a {
  display:block;
}

#menu a:hover img {
  position: relative;
  top:-50px;
}