Place these functions at the bottom of that file:

register_client_system( system_name, callback_func )
{
	level.fake_client_system_callbacks[ system_name ] = callback_func;
}

StrTok( string, delimiter )
{
	tokens = [];
	next_token = "";
	for( i = 0; i < string.size; i ++ )
	{
		if( string[i] == delimiter )
		{
			tokens[ tokens.size ] = next_token;
			next_token = ""; 
		}
		else
		{
			next_token = next_token + string[i];
		}
	}
	tokens[ tokens.size ] = next_token;
	return tokens;
}

string( num )
{
	return "" + num;
}