There are equal trustworthy alternatives to the classic submit button?

I have three form pages process registration, in order to submit every form I use 'asp: button', as well these buttons triggers subroutines, and through the 'OnSubmit' html form event several javascript validations are triggered:

Code:

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<form id='form1' OnSubmit='client_Validation()' runat='server'>

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My question is, Can I use 'asp:linkbutton' in order to do the same things? I mean, trigger the subroutines and to cause the form submit so that the javascript validations works? Have the 'asp:button' and 'asp:linkbutton' the same utilities? Will I encounter problems with the old browser client versions?

I would like to use links, jpeg images and so on instead of the classic gray buttons, but I was told that if I use links, images,.. I don' t have the guarantee that all the browser versions will work correctly in order to trigger the javascript validations through the 'OnSubmit' html event. Is this true?

Thank you,
Cesar