How to override the element 'span'?

Hello again...

I still trying to override some html tags to simple html...

I putted this code into config.js and it's not working:

config.colorButton_foreStyle = {element:'font',attributes:{'color':null},overrides:[{element:'span',styles:{'color':'#(color)'}}]};

With this code, I want to override the tag <span style="color:#00000"> to <font color="#000000">

Please, help me to fix my code...