Using while loops with if statments?

[jonathan2133 1]

i have the following code:

$checksum = PixelChecksum(235, 432, 241, 446)

While $checksum = PixelChecksum(235, 432, 241, 446)

Sleep(100)

WEnd

It waits until the pixels in the selected area changes then continues. The problem is im using this for a macro on a website and sometimes the server goes faster or slower than expected, and the pixels it finds to watch to change are already changed. This is not a problem 90% of the time, but that remaining 10% is a pain. How can i make it continue after a set amount of seconds has gone bye? I was thinking somthing along these lines:

$a = 100000

$checksum = PixelChecksum(235, 432, 241, 446)

While $checksum = PixelChecksum(235, 432, 241, 446)

$a = $a - 1

if $a = 1 (this is where i would use goto but its gone... i loved goto and totally object to its removal... but thats a new rant all together)

Sleep(100)

WEnd

I cant use goto and i tried a few other things but it seems the if statment will stop the while statment. How do i get around this?

[Valuater 112]

Maybe like this

$begin = TimerInit()
$checksum = PixelChecksum(235, 432, 241, 446)

While $checksum = PixelChecksum(235, 432, 241, 446)
$dif = TimerDiff($begin)
If $dif > 3000 Then ExitLoop
Sleep(100)
WEnd

Note; 1000 = 1 second

8)

Edited October 18, 2005 by Valuater