$(document).ready(function(){  
    setInterval( "slideSwitch()", 5000 );
    $('#login a').hover(
    function() {$(this).animate({ marginTop: "10px" }, 200);},
    function() {$(this).animate({ marginTop: "0" }, 200);}    
    );
    $('#signup a').hover(
    function() {$(this).animate({ marginTop: "10px" }, 200);},
    function() {$(this).animate({ marginTop: "0" }, 200);}    
    );    
});


function slideSwitch() {
    var $active = $('.banners a.active');
    if ( $active.length == 0 ) $active = $('.banners a:last');
    var $next =  $active.next().length ? $active.next()
        : $('.banners a:first');
    $active.addClass('last-active');
    $next.css({opacity: 0.0})
        .addClass('active')
        .animate({opacity: 1.0}, 1000, function() {
            $active.removeClass('active last-active');
        });
}