General :: Change The Signature Of All The Functions In Scripts?

I was trying to write a script to change the signature of the all the methods in a set of scripts.. here is a sample of the same :

old signature :

methodname()
{
method-body
}

New signature:

function methodname
{
method-body
}

That is i need to insert "function" keyword in front of the methodname and remove the () after the methodname.