Is how I would put it.

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Note added at 17 mins (2011-09-15 16:29:56 GMT)
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example

greatwallec.com/downloads/registration.pdf
File Format: PDF/Adobe Acrobat - Quick View
I, in my own behalf and on behalf of Minor, hereby warrant that I have read this Participant Release and Waiver Form in its entirety and fully understand its ...



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Note added at 1 hr (2011-09-15 17:36:25 GMT)
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IN or ON

be·half (b-hf, -häf)
n.
Interest, support, or benefit.
Idioms:
in behalf of
For the benefit of; in the interest of.
on behalf of
As the agent of; on the part of.
http://www.thefreedictionary.com/behalf


www.jstor.org/stable/2920095
by R Stewart - 1936 - Cited by 4 - Related articles
in this respect not merely on my own behalf, but on behalf of the litera- ture of my country. I may be as modest as I please in my own behalf, as modest as befits ...

Full text of "Some notes on the Tomlinson and Sullivan families"
www.archive.org/stream/.../somenotesontomli00np_djvu.txt
Furthermore, on my own behalf I do hereby authorize the said James ? ... as also in all bonds and quit claims, or receipts for money in my own behalf, as may be ...

www.aclu.org/files/projects/foiasearch/pdf/DOD046342.pdf
File Format: PDF/Adobe Acrobat
desire on my own behalf to accompany my request for discharge. Statements in my own behalf are submitted with this request. 2. 001824. DOD-046354 ...


The difference is very subtle but I stick with IN.