close the dialog with a web page

[Kevin]

the error message is very clear your variable has no value  so therefore  will error every time because your saying clo 0
the reason is because your missing a declaration that assigns a value to that variable.
i'm guessing you removed that part from further up in the code
In its current state it's just an empty variable.
 read more here
http://www.quickmacros.com/help/Language...ABLES.html 
and here
http://www.quickmacros.com/help/Language/IDP_SCOPE.html
 read section
http://www.quickmacros.com/help/
Variables, constants, numbers, strings