Warning message on JSP page

Hi all,
I have 2 JSP Pages, page 1 contains attachment button for (attachment to be uploaded ) and Done button for navigating to second JSP page. Currently Done button is not wait for the attachment to be uploaded .When user clicks on Done Button if attachment is in processing I need to display warning message like "attachment have not been attached. if you continue, attachment will be lost".with OK Cancel buttons.
Can anyone please suggest
Thanks in advance.
Bhavana

Please post JSP related queries here...
JavaServer Pages (JSP) and JSTL
Thanks
--Anil
http://oracleanil.blogspot.com

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