[xXziroXx]

I share Chris' experience with loading classes on clientside, and even had to write a work around for it:

PHP Code:

//#CLIENTSIDE
function onCreated()
{
//echo("Classes:" SPC player.joinedclasses);
//return;
  temp.classList = {
    "functions_buffs",
    "functions_items",
    "functions_messages",
    "functions_misc",
    "functions_stats",
    "functions_skills",
    "gui_initializer",
    "gui_basics",
    "gui_buff",
    "gui_item",
    "gui_skill",
    "gui_spell",
    "player_system",
    //"quest_npc"
  };
  
  for (temp.className: temp.classList) {
    // Load the class to the player
    if (!player.isInClass(temp.className))
      player.join(temp.className);
    
    // Maybe the class is loaded already?
    if (isClassLoaded(temp.className))
      continue;
    
    loadClass(temp.className);
    
    while (!isClassLoaded(temp.className))
      sleep(0.05);
  }
  
  triggerServer("gui", this.name, "initialized");
} 


Causes a 1-5 second delay in our "login level" depending on your latency when you first login during the session, but it's worth not getting any errors because of classes not having loaded yet.