$(function() {
  $('.rollover').hover(function() {
    var currentImg = $(this).attr('src');
    $(this).attr('src', $(this).attr('hover'));
    $(this).attr('hover', currentImg);
  }, function() {
    var currentImg = $(this).attr('src');
    $(this).attr('src', $(this).attr('hover'));
    $(this).attr('hover', currentImg);
  });
});

var newWin;
function OpenWindow(url, winname, w, h) {
  windowleft = (screen.width - w) / 2;
  windowtop = (screen.height - h) / 2;
  settings = '"toolbar=no,directories=no,menubar=no,scrollbars=yes,resizable=yes,status=no,width=' + w + ',height=' + h + ',left=' + windowleft + ',top=' + windowtop + '"';
  closeWindow();
  newWin = window.open(url, winname, settings);
  newWin.focus();
}
function closeWindow() {
  if (newWin && !newWin.closed) {
    newWin.close();
  }
}