onsubmit action
<html> <head> <script type="text/javascript"> function confirmAction() { return confirm("Do you really want to do this?") } </script> </head> <body> <form action="" onsubmit="return confirmAction()" method="post"> <textarea name="comments" rows="6" cols="46"></textarea> <input type="submit" value="Submit" /> </form> </body> </html>