function mover(iname)
{
	document.images['button_'+iname].src = 'images/button_'+iname+'a.jpg';
}

function mout(iname)
{
	document.images['button_'+iname].src = 'images/button_'+iname+'.jpg';
}

function nieuwvenster(url,w,h)
{
	var l = (screen.availWidth-w)/2;
	var t = (screen.availHeight-h)/2;

	thiswin = window.open(url,'imgpopup','toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=no, resizable=no, copyhistory=no, left='+l+', top='+t+', width='+w+', height='+h);
	thiswin.focus();
}