disable button

[CONFIQ]

Hello all.... i wander,how do i disable <input type=button from JS?

And is it possible from frame like

parent.name_of_iframe.disable.myform.mybutton = true ???????

if you don't know the second question plz answer at least the first one...

Thank you

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CONFIQ

[joeframbach]

parent.nameofiframe.document.myform.bybutton.disabled=true