function prepare(names) {
	preload = Array();
	cpreload = names.length;
	for (i=0; i<cpreload; i++) {	
		var im = document.getElementById(''+i);
		im.ostate = false;
		im.osrc = '/art/buttons/'+names[i]+'_m.gif';
		preload[i] = new Image();
		preload[i+cpreload] = new Image();
		preload[i].src = im.src;
		preload[i+cpreload].src = im.osrc;

	}
}
function button(id, state) {
	var im = document.getElementById(id);
	if (im.ostate != state) {
		var ims = im.src;
		im.src = im.osrc;
		im.osrc = ims;
		im.ostate = state;
	}		
}