custom scrollbar - can't figure out 1

[whoknows361]

hello all. I have created a custom scrollbar - but I can't figure out why the up buttom scrolls past the maincontent movieclip.

I have tried a number of fixes, but can't seem to figure out the problem. Please download the fla below & see that my scrollface & scrolltrack & down arrow work - but when you click on the up arrow once - it scrolls past the main content.

Would really appreciate any guidance. Thanks
Jonathan
here's the file

http://www.prettyventures.com/problem.zip

 

[billwatson]

following changes do the trick

final = contentMain._y
offset = maskedView._y - contentMain._y

btnUp.onPress = function() {
this.onEnterFrame = function() {
if (contentMain._y+speed<maskedView._y-offset) {
if (scrollFace._y<=top) {
scrollFace._y = top;
} else {
scrollFace._y -= speed/moveVal;
}
contentMain._y += speed;
} else
scrollFace._y = top;
contentMain._y = final
delete this.onEnterFrame;
}
};
};

 

[whoknows361]

thanks so much Bill = I didn't even recognize the offset value!

Once last question - perhaps can you tell me why when you click on the up button once, the entire scrollbar continues until it reaches the top & text scrolls up until it reaches the top. ?

Thanks again for the previous assistance.
Jonathan

 

[billwatson]

its these two lines that make it scroll all the way

this.onEnterFrame = function() {
if (contentMain._y+speed<maskedView._y-offset) {

 

[whoknows361]

thanks again