function change_img(img,id,action) {
path='/img/'+img;
var newImage = new Image();
newImage.src = path;
newImage.onload = function()   {document.getElementById('foto_'+id).src=path;}
document.getElementById('foto_'+id).src=path;
if(action=='full')	document.getElementById('foto_'+id).parentNode.href='/img/'+img;}