Changing Image URL
jQuery, .attr
by codeSpy
HTML
<img src="http://www.hdwallpapersdj.com/wp-content/uploads/2013/09/cartoon-1.jpg" width="100px" height="100px" />
<input type="button" value="Change Image" />
JavaScript
$("input").click(function(){
var newImageUrl = "http://images2.fanpop.com/image/photos/14000000/Disney-Cartoon-wallpaper-classic-disney-14019904-1024-768.jpg";
$("img").attr("src", newImageUrl);
});