SQL Server 2008 :: Return From Script Instead Of Drop Existing For DDL Scripts?

Let's say I have a function named MyCustomFunction and I want to ensure that it exists in the database. Let's say I have a create script for the function. I want the script to be runnable multiple times if needed. A common way to do this is to check for an object_id at the top of the function like this:

IF OBJECT_ID('MyCustomFunction') IS NULL
DROP FUNCTION MyCustomFunction
GO
CREATE FUNCTION MyCustomFunction...

But is there a more elegant way to do this? For example, instead of dropping and recreating the function, is there a way to simply exit from the script and do nothing if the function already exists? Something like this:

IF OBJECT_ID('MyCustomFunction') IS NULL RETURN
GO
CREATE FUNCTION MyCustomFunction...