function galery (id,src) {
	var small = document.getElementById(id);
	var big = document.getElementById('img_big');
	big.src = src;
	var im = document.getElementById('galery_ul').getElementsByTagName('li');
                for (j=0; j<im.length; j++) {
                    im[j].className = ''; 
                }
                small.className = 'active';
}