Problem with crawl pose and armThread

function WeaponImage::onMount(%this, %obj, %slot)
{
// Images assume a false ammo state on load. We need to
// set the state according to the current inventory.

   // Display the correct weapon HUD
   %obj.client.displayWeaponHUD(%this.getName());

   if (%obj.getInventory(%this.ammo)){
   %obj.setImageAmmo(%slot,true);
   %currentAmmo = %obj.getInventory(%this.ammo);

   if (%obj.getInventory(%this.clip))
      %currentClip = %obj.getInventory(%this.clip);
   }
   if(%currentAmmo < 1){
   %currentAmmo = 0;
   %currentClip = %obj.getInventory(%this.clip);
   }
   if(%currentClip < 1){
   %currentClip = 0;
   %currentAmmo = %obj.getInventory(%this.ammo);
   }

   %obj.client.setAmmoAmountHud(%currentAmmo);
   %obj.client.setClipAmountHud(%currentClip);

%client = %obj.client;

if (%client.player.getPosition() != 3)
{
	if (%this.armthread $= "" )
   		%obj.setArmThread(root);
   	else
		%obj.setArmThread(%this.armThread);
}
}

function GetPlayerPosi(%client)
{
   if (isObject(%client.player))
      return %client.player.getPosition();
   else
      return 0;
}

I would my player have a armThread ONLY stay in Stand pose and Crouch...
when my player STAY ONLY IN A CRAWL POSE the armThread not function and stay only in a Crawl pose....
When return in a stand pose or crouch pose the armThread return....
Please help me....
The modify not function...