< ;a href="www.jb51.net">Mouse over it and see what happens
jq =jQuery.noConflict(); This is the jquery library name that defines a js; jq(document).ready(function(){ /*This is a function about the document object. Inside is the function Content*/ }); jq("a").mouseover()function(){ /*This is the content that defines the event mouseover*/ }. A practical example; hide text when clicked: