JavaScript changing CSS properties

Job ID: 34386687

Budget: $10 – $30 USD

I need a JavaScript code that, dynamicaly adds code before and after every 'px' propertie.

Example:
As it is -> .style{ padding: 30px }
Change to -> .style{ padding: calc( 30px * 3 ) }
Related categories: JavaScript CSS HTML5 HTML jQuery / Prototype