function click_action(obj,action,id)
{
var height;
var tr;
var tr_id="tr_"+id;

tr=document.getElementById(tr_id);

//style='background-image: url(/images/procesando.gif)'
tr_array[id]=tr.innerHTML;
height=tr.scrollHeight;
tr.innerHTML="<td height="+height+"><br></td>";

document.getElementById(tr_id).style.backgroundImage="url('/images/procesando.gif')";
window.open('xaction.php?action='+action+'&usuariodb=$usuario&refdb=$nid&slibro=$slibro','_blank','width=500,height=300,scrollbars=no,resizable=no,top=100,left=100')
}