javascript - working with timings

anyone dealt with timings in javascript using the setTimeout and setInterval

I am having real issues where it is not doing it correctly.

mainly seems to when others are running.

what I am doing is a simple set interval
but they seem to not be working right

is this a know issue, not to trust timeings

I have noticed some other inaccuracies

let me know if you have dealt with this stuff

thanks

I've done some work with setTimeout and setInterval - whats the problem your having?

well this issue that it does not work right

I did some javascript animation

I told it to move an object 1 pixel every 100ms
for like 10000ms

and it did, problem was that on different machines it moved a different amount of pixels in that time!

so I figured maybe slower pcs was taking longer to actually run the function and it was backing up.

so I made it move every 500ms, nothing worked.

I ended up having toi include a stop check in the function to stop after the right number of pixels.

Now I am animating a resize and in some instances (to maintain aspect ratio) I am moving like 0.11 pixels and it looks like it can't handle that amount. now I could change it and use time to move it 1 pixel but calc the time diff, but because of my time issues that will probably not work!

I am a little frustrated, I guess I am asking just too much!