How do I check if a nonclustered index exists in SQL Server 2005

I have the following:

CREATE NONCLUSTERED INDEX [MyTableIndex]
ON [dbo].[tablename] ([tablename_ID],[tablename_Field1])
INCLUDE ([Tablename_Field2],[Tablename_Field3])

I want to create an if statement to check if this exists. How do I do this?

IF NOT EXISTS(SELECT * FROM sys.indexes WHERE name = 'MyTableIndex' AND object_id = OBJECT_ID('tablename'))
    BEGIN
        -- Index with this name, on this table does NOT exist
    END

Try this:

IF NOT EXISTS(SELECT * FROM sys.indexes WHERE Name = 'MyTableIndex')
   -- put your CREATE INDEX statement here