http://www.good-tutorials.com/track/8206

here is the tutorial for it... If you wanna use the same picture i use copy this
http://www.inexplicabledesigns.com/brandon/images/example.gif
or you can just use your own... lets start.
1.grab the Polygonal lasso tool
2. outline the shape with it... (it doent have to be exact just be close)
http://www.inexplicabledesigns.com/brandon/Ani%20Sig%20TUT/2.gif
3. copy that edit>copy or ctrl+c
4. Paste it (ctrl +v)
5. now you should have two layers.
6. now create a new layer.
7. grab the gradient tool and make this
http://www.inexplicabledesigns.com/brandon/Ani%20Sig%20TUT/3.gif
8 Press ctrl+g to group them and set the blending mode to screen
this is what it should look like
http://www.inexplicabledesigns.com/brandon/Ani%20Sig%20TUT/4.gif
9. move the gradient layer up. till it is just out of site. then go to image ready
10.duplicate the frame. on the second frame move the gradient layer down till not visible again.
http://www.inexplicabledesigns.com/brandon/Ani%20Sig%20TUT/5.gif
11. press the tween button (next to the duplicate frame button.)
use these settings and your done
http://www.inexplicabledesigns.com/brandon/Ani%20Sig%20TUT/6.gif
you can do multiple spots. but you are done now.
Here is my final http://www.inexplicabledesigns.com/brandon/images/cool-sig.gif
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Uh, how would you animate texts?

same way. make a gradient layer, with that line, and put it right above your text, and (in photoshop 8/7/whatever) hit Ctrl-G, animate the same way...in ps cs 2 (9) hit Ctrl-Alt-G...

I don't understand that.......sorry but could you make it a bit clearer for a dumb in animation like me ???? ^_- plz

Thanks for the help foog, but I found it out and here's a site if you need a tut.

http://www.kev-designs.com/forum/viewtopic.php?t=644