var im = new Array;
for( var i=0; i<4; i++ ) {
	im[i] = new Image;
	im[i].src = '/images/plus'+i+'.gif';
};
function chpic( obj, id ) { obj.src = im[id].src; }

var logo = new Array;
logo[0] = new Image;
logo[0].src = '/images/logo.gif';
logo[1] = new Image;
logo[1].src = '/images/logo_.gif';
function chlogo( obj, id ) { obj.src = logo[id].src; }