Prevent Submit Button Clicked Twice/ Prevent Double Click

Hi,i'm italian developer and i'm new member of this mailing list.
I have a problem with WO: in a my application there is a booking wizard
composed by a sequence of components, from a component to the next i send
some data with a form with attribute "multipleSubmit = true;" (because the
are two WOSubmitButton, one to undo and one to continue), good, how can i
prevent a submit button to click twice?
Setting WOAllowsConcurrentRequestHandling=false property seems doesn't help
me.
Using Javascript like this onclick = "this.disabled=true; this.submit();" to
disable the button while the component is calculating, blocks the
submitting.

Please, help me.
Thank you.

-- 
Federico Cattozzi

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