function enlarge_photo(element, imgsize) {
var dphoto = document.getElementById('photo0').src;
var dphoto_src = dphoto.replace('/2/','/4/');
var mphoto = document.getElementById(element).src;
var mphoto_src = mphoto.replace('/4/','/2/');
var mphoto_link = mphoto.replace('/4/','/'+imgsize+'/');
document.getElementById(element).src=dphoto_src;
document.getElementById('photo0').src=mphoto_src;
document.getElementById('photo0_link').href=mphoto_link;
}