delay in seconds

how can i say "if click X times in Y seconds" in php language

namely

for example

(if i click a link 5 times in 2 seconds a window will be up )

wich loop do i have to use ?

You can't do that in PHP, you are looking for a client side language.

Continued here: http://www.codingforums.com/showthread.php?t=133651