Smooth Scroll To from link hash in a defined container especially done for OnePage websites.

smoothScrollTo.jquery.js

/*
Use example :
$('a[href^="#"]').SmoothScrollTo('slow', 'container');
or
$('a[href^="#"]').SmoothScrollTo();

A margin is automaticaly taken from the container padding-top.
*/

(function($) {

	var methods = {
		 init: function (settings) {
         	settings = $.extend( {
              'speed'         : 'slow',
              'container'      :  navigator.userAgent.match('Chrome') ? 'body' : 'html'
            }, settings);

         	var topMargin = parseInt($(settings.container).css('padding-top'));

         	return this.each( function() {
				$(this).on('click', function(e) {
					e.preventDefault();
					methods.jumpTo(
						$(this).attr("href")
						, $(settings.container)
						, topMargin
						, settings.speed
					);
				});
			});

         }, 
         jumpTo: function(hash, $container, topMargin, speed) {
         	var regex = new RegExp("(.*)\#(.*)","gi");
			 
			//&& hash != location.hash => prevents redo
			if ( hash.match("\#(.+)")  ) {
				hash = hash.replace(regex,"$2");

				if ( $('#'+hash).length > 0 ) {
					var scroll = $('#'+hash).position().top - topMargin;

					$container.animate( {
						scrollTop: scroll
					}, 
					speed,
					function() {
						if(history.pushState) {
						    history.pushState(null, null, '#'+hash);
						}
						else {
						    location.hash = '#'+hash;
						}
					});

				}
			}
         },
         //Just used for window load event, can be easily removed.
         load: function(settings) {
         	settings = $.extend( {
              'speed'         : 'slow',
              'container'      :  navigator.userAgent.match('Chrome') ? 'body' : 'html'
            }, settings);

         	var topMargin = parseInt($(settings.container).css('padding-top')),
         		$container = $(settings.container);

			if ( location.hash != undefined && $(location.hash).length > 0) {
				//Check if the scroll is near the hash so scrolling is not needed
				var nearTo = ( ($(location.hash).position().top - topMargin) / $container.scrollTop() );

				//1 is right on it
				if(nearTo > 1.5 || nearTo < 0.95) {
					var scroll = $(location.hash).position().top - topMargin;

					$container.animate({ scrollTop: scroll }, settings.speed);
				}

			}

			return false;
		 
         }
	};

	$.fn.SmoothScrollTo = function() {
		return methods.init.apply( this, arguments );
	};
 	

	// Load slide on window load
	$(window).load(function() {
		return methods.load.apply( this, arguments );
	});
 
})(jQuery)