//plugin
jQuery.fn.topLink = function(settings) {
	settings = jQuery.extend({
		min: 1,
		fadeSpeed: 200
	}, settings);
};

//usage w/ smoothscroll
$(document).ready(function() {
	//set the link
	$('#top-link').topLink({
		min: 400,
		fadeSpeed: 500
	});
	//smoothscroll
	$('#top-link').click(function(e) {
		e.preventDefault();
		$.scrollTo(0,500);
	});
});