$(document).ready(function () {
  $(window).resize(wincenter);
  wincenter();
  $('#e1 img').hover(function(){$(this).attr('src','images/vampirobrillo.png');},function(){$(this).attr('src','images/vampiro.png');});
  $('#e2 img').hover(function(){$(this).attr('src','images/piratabrillo.png');},function(){$(this).attr('src','images/pirata.png');});
  $('#e3 img').hover(function(){$(this).attr('src','images/niñosbrillo.png');},function(){$(this).attr('src','images/niños.png');});
  $('#e4 img').hover(function(){$(this).attr('src','images/clubeducolandiabrillo.png');},function(){$(this).attr('src','images/clubeducolandia.png');});
});

function wincenter()
{
  aux=parseInt((($(document.documentElement).attr('clientHeight'))-($("#wrap").height()))/2);
  if (aux<0) aux=0;
  $("#wrap").css('top', aux+'px');
  aux2=parseInt((1200-($(document.documentElement).attr('clientHeight')))/2)+1;
  if (aux2<0) aux2='center'; else aux2='-'+aux2+'px';
  $("body").css('background-position','center '+aux2);
}