Need code to merge PDF files in a folder using adobe acrobat X

[ZVI]

For referencing to Acrobat X Pro library:
1. Use VBE - Tools - References
2. Uncheck the previously set reference to Acrobat (or Adobe Acrobat ##.# Type Library)
3. Use button Browse to choose the file ACROBAT.TLB in the Acrobat X Pro installation folder (subfolder Acrobat)
4. Press OK