HTML
{
  height:100%;
}
BODY 
{
  background-color: #2E3B90;
  margin:0px;
  padding:0px;
  height:100%;
}

TABLE#pervtable
{
  height:100%;
  width:100%;
}
TABLE#pervtable TD
{
  text-align:center;
  vertical-align:middle;
}

#zastavka1
{
  display:inline;
  visibility:visible;
}

#zastavka2
{
  display:none;
  visibility:hidden;
}