Members having problems posting

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Some of my forum members are complaining of the following error:

 Microsoft VBScript runtime error '800a000d'Type mismatch: 'CInt'
/forum/new_post.asp, line 358
One of the members was using Google Chrome and another was using Safari, which are pritty much the same thing.
The error seems to relates to this block of code:

If Request.Form("PN") = "" Then

    intReturnPageNum = 1

Else

    intReturnPageNum = CInt(Request.Form("PN"))

End If
Would it not be better to do the following, since you want to make sure its a number?

If NOT isNumeric(Request.Form("PN")) Then

    intReturnPageNum = 1

Else

    intReturnPageNum = CInt(Request.Form("PN"))

End If