function viewImg(id) {
		for(num=1; num<=26; num++){
		document.getElementById('thum'+num).style.visibility='hidden';
		}
		document.getElementById(id).style.visibility='visible';
}
function hideImg() {
	for(num=1; num<=26; num++){
	document.getElementById('thum'+num).style.visibility='hidden';
	}
}