/*
function swapImages(link) {
	newsrc = $(link).down('img').src.replace('/thumb', '/big');
	$('big_img').src = newsrc;
}
*/
function change_image(el) {
    var new_image = el.getElementsByTagName('img')[0].src.replace('/thumb', '/big');
    $('big_img').getElementsByTagName('img')[0].src = new_image;
}