Java Script is a client side scripting language developed by Netscape to enable web authors to design interactive sites. Java Script can interact with html language and mainly used for client side purpose such as implementing validation rules on user input and for creating html content dynamically. Java Script is an open language which means any one use this language for implementing performance without purchasing it. It is supported by almost all type of browser such as Internet Explorer, Netscape Navigator, Mozilla Firebox, Google Chrome etc.