function logo() {
	$('home').onmouseover = logo_onmouseover;
	$('home').onmouseout = logo_onmouseout;
}

function logo_onmouseover() {
	$('header').setStyle({background:'url("/wp-content/themes/dylanmckinstry/images/header.gif") no-repeat 0 -150px'});
}

function logo_onmouseout() {
	$('header').setStyle({background:'url("/wp-content/themes/dylanmckinstry/images/header.gif") no-repeat 0 0'});
}

Event.observe(window, 'load', logo, false);