Watermark with user entered data

hi,  trying add watermark pdf document has current date , number.  number unique document , must entered manually. 

 

i entered following in th custom calculation script field field:

 

var cask = "enter text" ;
var ctitle = "text entry" ;

event.value = app.response(cask, ctitle);

 

it seems work other user sees dialog box 4 times. 

 

1. when identify pdf file source on add watermark screen

2. after select ok on add watermark screen, on document (adding watermark)

3. on document, application completes loading watermark

4. when application completes process

 

only third instance adds text watermark.  there way have dialog box show once?

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