Find width of loaded img

What I want to happen is a movieclip of text aligns 20px to the right of the loaded img, similar to what padding does in css, the code I am using is:
textFields._x = (picture._width+20);
textFields is the movieclip of text and the image is loading into picture

What actually happens is the the text aligns to picture._width but before the image the image has loaded or I am not telling it the right place to look for ._width

I’ll include the .fla in for convenience

As always much thanks to anyone with a suggestion