Try this maybe?
Code:
sub EVENT_ITEM_CLICK {
if ($itemid == #) {
$client->SetHP(($client->GetHP() + int($client->GetMaxHP() * .1)));
$client->SetMana(($client->GetMana() + int($client->GetMaxMana() * .1)));
$client->SetEndurance(($client->GetEndurance() + int($client->GetMaxEndurance() * .1)));
}
}