Make "Processing/loading" messages When Processing some action

Applications Forms
#1

[h=2][FONT=inherit][SIZE=13px]HI, How to make Processing/Loading in when processing some action? e.g : after submit , i have email function that take time to finish “send mail processing” . So while processing that email , i want appear loading/processing messages. Thanks ![/SIZE][/h]
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#2

If you use a PHP button to send the emails, the processing message will show/hide automatically…

#3

Hai Mamede ! Thank for replying. sorry, but i cannot see/find that processing message while sending email. Tq @Mamede