function setBackground() {
  if ((screen.width>1920) || (screen.height>1200))
    $('body')
    .css({'backgroundImage': 'url(images/home45z.jpg)'})
    .show();
}

function slideSwitch() {
    var $active = $('#slideshow IMG.active');

    if ( $active.length == 0 )
       $active = $('#slideshow IMG:last');

    // use this to pull the images in the order they appear in the markup
    // var $next =  $active.next().length ? $active.next()
    var $next =  $active.next();

    $active.addClass('last-active');

    $next.css({opacity: 0.0})
        .addClass('active')
        .animate({opacity: 1.0}, 1000, function() {
            $active.removeClass('active last-active');
        });
}

$(function() {
  setBackground();
  setInterval( "slideSwitch()", 6000 );
});