Today i faced i problem where i want to use jquery with other javascript library (Prototype). By default jquery is using "$" as a short key for jQuery. When you use jQuery with other javascript library,jQuery object and prototype object were using same variable($). As a result they conflict with eachother and one of the functionality of javascript library will be missed. If you want to use jquery with other javascript library(Prototype, MooTools, or YUI) at the same time than you have to use different object instead of "$".

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