Need help with scripting

[reper1210]

I want to add the following effect into this script but im not sure how to do it.

void FadePlayerRollTo(float afX, float afSpeedMul, float afMaxSpeed);

I dont know if it requires its own string or if i can put it with something. and for future reference should i be posting this question somewhere else?
////////////////////////////////////////////////////////////////
void OnStart()
{
SetEntityPlayerInteractCallback("key_laboratory_1", "ActivateMonster", true);
AddUseItemCallback("OpenDoor", "key_laboratory_1", "level_hub_1", "UnlockLevelDoor", true);
}

void OnEnter()
{

}

void OnLeave()
{

}

void ActivateMonster(string &in item)
{
SetEntityActive("servant_brute_1", true);
AddEnemyPatrolNode("servant_brute_1", "PathNodeArea_1", 0, "Idle");
AddEnemyPatrolNode("servant_brute_1", "PathNodeArea_2", 0, "Idle");
}

void UnlockLevelDoor(string &in item, string &in entity)
{
SetLevelDoorLocked(entity, false);
}