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Your store layout, design, and functionality can be customized using the design tools available in the Admin panel. However, if you have a working knowledge of JavaScript, you can make additional changes to enhance your store. Magento Go lets you add custom, client-side JavaScript files which are executed at the browser level, rather than on the server
This material was written for frontend developers who have a working knowledge of JavaScript. In this section, you will learn how to work with JavaScript libraries, hosted scripts, and snippets of code to implement custom features. It is important to understand that different versions of JavaScript might conflict with each other. The jQuery.noConflict() function returns control of the $ variable to the library from which it was first implemented. To learn more, visit the jQuery site.