$('#header h2 a.events').mousedown(function(){
    $(this).css('background-position','0 -324px');
}).mouseup(function(){
    $(this).css('background-position','0 -162px');
}).mouseout(function(){
    $(this).css('background-position','0 0');
}).mouseover(function(){
    $(this).css('background-position','0 -162px');
});

$('#header h2 a.register').mousedown(function(){
    $(this).css('background-position','188px -324px');
}).mouseup(function(){
    $(this).css('background-position','188px -162px');
}).mouseout(function(){
    $(this).css('background-position','188px 0');
}).mouseover(function(){
    $(this).css('background-position','188px -162px');
});