Hi, there is js part of fb share:
function fbs_click() {
var u=site_url_to_share;
var share_url='http://www.facebook.com/sharer.php?u='…ent_pano_title);
window.open(share_url ,'sharer','toolbar=0,status=0,width=626,height=436');
return false;
}
you should call this javascript function from xml file