This is a behavior of the browser and not of your application.
AFAIK there is no way to override the Open/Save dialog and instead display the Save dialog.
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Read this if you want to know how to get a correct reply for your question:
http://www.catb.org/~esr/faqs/smart-questions.html
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.: Wrox Technical Editor / Author :.
Wrox Books 24 x 7
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