function update_user_box(fb_pic, fb_user, id_user) 
{
	if(fb_pic != "")
	{
		var fb_pic_box = document.getElementById(fb_pic); 
		fb_pic_box.innerHTML = "<fb:profile-pic uid='" + id_user + "' facebook-logo='true' />" 
		
	}
	if(fb_user != "")
	{
		var fb_user_box = document.getElementById(fb_user);
		fb_user_box.innerHTML = "<fb:name uid='" + id_user + "' useyou='false' />" 
	}
	FB.XFBML.Host.parseDomTree();
} 


function WriteButtonLoginFB(fb_bt, onlogin)
{
  var fb_button = document.getElementById(fb_bt); 
  fb_button.innerHTML = "<fb:login-button v=\"2\" size=\"small\" onlogin=\""+onlogin+"\">Con&eacute;ctate</fb:login-button>"; 
  FB_RequireFeatures(["XFBML"], function() {FB.XFBML.Host.parseDomTree();});
} 

function writePicProfile(fb_pic, id_user,w,h) 
{
	var fb_pic_box = document.getElementById(fb_pic); 
	pic = "<fb:profile-pic uid='" + id_user + "' ";
	if(w != "")
		pic += "width='" + w + "'  ";
	if(h != "")
		pic += "height='" + h + "'  ";
	pic += " />" 
	fb_pic_box.innerHTML = pic;	
	FB.XFBML.Host.parseDomTree();
}