>I believe you need to remove the disabled attribute to reenable it. See http://www.w3schools.com/dom/met_element_removeattribute.asp.

Thanks, Rob. I decided to try to use this in my code

<<IIF(llSigCapture AND (This.nDIN GT 0 OR this.lGetSignature),'disabled="disabled"','')>>

In other words, only inject this attribure when necessary. However, something is wrong with out function, as I'm getting an error
Function name is missing )

Do you see if something is wrong with this expression?