How do I remove Format, Size and Font dropdowns?

I'm using CKEDITOR with GetSimple. I have the styles set like this but since this is for a CMS I don't want to give people the ability to change Format, Size and Font. Can I set the code in ckeditorstyles.js to remove them? This is what I have in there:

CKEDITOR.editorConfig = function( config )
{
   // Define changes to default configuration here. For example:
   config.toolbarCanCollapse = false; // hide toolbar collapse button
   config.stylesCombo_stylesSet = 'my_styles'; 
};


CKEDITOR.addStylesSet( 'my_styles',
[
    // Block Styles    
    { name : 'Heading', element : 'div', styles : { 'color':'#5b6100','font-family':'Arial, Helvetica, sans-serif','font-size':'14px','font-weight':'bold' }, attributes : { 'class' : 'heading' }},

  { name : 'Normal', element : 'p', styles : { 'color':'#646464','font-family':'Arial, Helvetica, sans-serif','font-size':'14px' }, attributes : {'class' : 'normal' } },

]);

Thanks!
Charles