How to keep the sidebars of table scrolling

I have three tables in my website the middle table,right side table and a left side table. when 开发者_如何学编程the content of the middle table increases it becomes scrollable but I am not able to make the sidebars also scrollable. How to do it using html and css? the website url is: http://www.bestindiacollege.com

the simple answer unfortunately is don't use tables for layout, your html/css is a mess of table/tr/td's and could be easily done with just divs and css. i know this isn't the most helpful advice but i would take some time to learn to make layouts with CSS