# A question about tween() function by Zeh Fernando. Help please

**URL:** <https://forum.kirupa.com/t/a-question-about-tween-function-by-zeh-fernando-help-please/142901>\
**Category:** Uncategorized\
**Created:** [April 1, 2005, 11:24am UTC](https://forum.kirupa.com/t/a-question-about-tween-function-by-zeh-fernando-help-please/142901 "2005-04-01T11:24:02Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![mx\_guest2004](https://avatars.discourse-cdn.com/v4/letter/m/e47c2d/32.png) [@mx\_guest2004](https://forum.kirupa.com/u/mx_guest2004)\
**Post date:** [April 1, 2005, 11:24am UTC](https://forum.kirupa.com/t/a-question-about-tween-function-by-zeh-fernando-help-please/142901/1 "2005-04-01T11:24:02Z")

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Hi,  
If you are familiar with Fernando’s function tween(), can I call the callback function in the middle of the tweening?  
In this address: [http://hosted.zeh.com.br/mctween/index.html](http://hosted.zeh.com.br/mctween/index.html)  
I mean for example:  
MC1 fades in from 0 to 100. I start fading MC2 when the MC1.\_alpha=50;

Thanks.