Here i am writing code how to add option of theme change and layout change in your website. Below are the steps you have to follow for this *- Make Layout for each (i.e left,top,right)   *- Make Css for each(as per your choice)   *- Create a folder named theme and put all yor layout and other file for each theme respectivley   *- In Css directory create directory for each theme and put all your css and js file in respective directory  

#### **Make table named theme where each theme name has its themeID,name**

In Layout