How to display saving alert for a form

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Hi, i want to put a saving alert (popup) whenever a form is closed without saving .

 Please can any one suggest me how to achevie it

. Thanks in advance

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  • This is default feature of IE 8 and above.  Like if you change a field on Account form & without saving you close the Account form you get a popup as follows.

  • This is the default feature of IE 8 and above.  For example if you open an Account form change some fields on it & close the form you get a popup as below.