if (document.images) {
	button1up = new Image();
	button1up.src = 'images/navtop1.png';
	button1over = new Image();
	button1over.src = 'images/navtop1act.png';
	button2up = new Image();
	button2up.src = 'images/navtop2.png';
	button2over = new Image();
	button2over.src = 'images/navtop2act.png';
	button3up = new Image();
	button3up.src = 'images/navtop3.png';
	button3over = new Image();
	button3over.src = 'images/navtop3act.png';
	button4up = new Image();
	button4up.src = 'images/navtop4.png';
	button4over = new Image();
	button4over.src = 'images/navtop4act.png';
	button5up = new Image();
	button5up.src = 'images/navtop5.png';
	button5over = new Image();
	button5over.src = 'images/navtop5act.png';
	button6up = new Image();
	button6up.src = 'images/navtop6.png';
	button6over = new Image();
	button6over.src = 'images/navtop6act.png';
}

function mouseup(imagename) {
	if (document.images) {
		document[imagename].src = eval(imagename+'up.src');
	}
}

function mouseover(imagename) {
	if (document.images) {
		document[imagename].src = eval(imagename+'over.src');
	}
}