var bp = function(){

	$('home3').setStyle('background-position', '0px -467px');

}

var cpf = function(){

	$('home3').setStyle('background-position', '0px -934px');

}

var up = function(){

	$('home3').setStyle('background-position', '0px 0px');

}

window.addEvent('domready', function() {
	
	$('bplink1').addEvent('mouseenter', bp);
	$('bplink1').addEvent('mouseleave', up);
	$('bplink2').addEvent('mouseenter', bp);
	$('bplink2').addEvent('mouseleave', up);
	$('bplink3').addEvent('mouseenter', cpf);
	$('bplink3').addEvent('mouseleave', up);
	$('bplink4').addEvent('mouseenter', cpf);
	$('bplink4').addEvent('mouseleave', up);
	
});