Timer, function, element & maybe Ajax & php

Timer, function, element & maybe Ajax & php

Hi,

This is the scenario I want to created. I have 10 products which I want to display and which have their on unique count down timer.

1) I have retrieved Timer(from mysql)
2) <p> will display the count down timer              *Note my theory was element <p> was to call the function(Timer mysql) by itself and if the condition is wrong. Update the <p> text without loading (I believed got to do with Ajax) and perform again the function 1 sec later.
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1) How to run/called a function by itself inside a element?
2) Could any explain how Ajax works

Regards
Benson