Smooth Scroll jQuery Plugin - Automatically make same-page links scroll smoothly

Smooth Scroll jQuery Plugin automatically makes same-page links scroll smoothly.

$.fn.smoothScroll:

• Allows for easy implementation of smooth scrolling for same-page links.
• Works like this: $('a').smoothScroll();
• Specify a containing element if you want: $('#container a').smoothScroll();
• Exclude links if they are within a containing element: $('#container a').smoothScroll({excludeWithin: ['.container2']});
• Exclude links if they match certain conditions: $('a').smoothScroll({exclude: ['.rough','#chunky']});
• Adjust where the scrolling stops: $('.backtotop').smoothScroll({offset: -100});
• Add a callback function that is triggered before the scroll starts: `$('a').smoothScroll({beforeScroll: function() { alert('ready to go!'); }});
• Add a callback function that is triggered after the scroll is complete: $('a').smoothScroll({afterScroll: function() { alert('we made it!'); }});
• Add back button support by including a history management plugin.