# How to use protoType

**URL:** <https://forum.kirupa.com/t/how-to-use-prototype/124987>\
**Category:** Uncategorized\
**Created:** [October 8, 2004, 3:12pm UTC](https://forum.kirupa.com/t/how-to-use-prototype/124987 "2004-10-08T15:12:50Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Erica](https://avatars.discourse-cdn.com/v4/letter/e/9dc877/32.png) [@Erica](https://forum.kirupa.com/u/Erica)\
**Post date:** [October 8, 2004, 3:12pm UTC](https://forum.kirupa.com/t/how-to-use-prototype/124987/1 "2004-10-08T15:12:50Z")

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It is me again. Sorry, I have too much questions. ^^

If I create a empty MC, and then loading a jpg on it, how to use protoType to adjust it is size? for example:

MovieClip.prototype.size = function () {  
mc = this[name].empty;  
mc.loadMovie(picarr\*);  
mc.\_width = 40;  
mc.\_height = 40;  
}

It doesn’t work, but why and how?