/**
 * jquery.scrollFollow.js
 * Copyright (c) 2008 Net Perspective (http://kitchen.net-perspective.com/)
 * Licensed under the MIT License (http://www.opensource.org/licenses/mit-license.php)
 * 
 * @author R.A. Ray
 *
 * @projectDescription	jQuery plugin for allowing an element to animate down as the user scrolls the page.
 * 
 * @version 0.4.0
 * 
 * @requires jquery.js (tested with 1.2.6)
 * @requires ui.core.js (tested with 1.5.2)
 * 
 * @optional jquery.cookie.js (http://www.stilbuero.de/2006/09/17/cookie-plugin-for-jquery/)
 * @optional jquery.easing.js (http://gsgd.co.uk/sandbox/jquery/easing/ - tested with 1.3)
 * 
 * @param speed		int - Duration of animation (in milliseconds)
 * 								default: 500
 * @param offset			int - Number of pixels box should remain from top of viewport
 * 								default: 0
 * @param easing		string - Any one of the easing options from the easing plugin - Requires jQuery Easing Plugin < http://gsgd.co.uk/sandbox/jquery/easing/ >
 * 								default: 'linear'
 * @param container	string - ID of the containing div
 * 								default: box's immediate parent
 * @param killSwitch	string - ID of the On/Off toggle element
 * 								default: 'killSwitch'
 * @param onText		string - killSwitch text to be displayed if sliding is enabled
 * 								default: 'Turn Slide Off'
 * @param offText		string - killSwitch text to be displayed if sliding is disabled
 * 								default: 'Turn Slide On'
 * @param relativeTo	string - Scroll animation can be relative to either the 'top' or 'bottom' of the viewport
 * 								default: 'top'
 * @param delay			int - Time between the end of the scroll and the beginning of the animation in milliseconds
 * 								default: 0
 */
(function($){$.scrollFollow=function(box,options){box=$(box);var position=box.css('position');function ani(){box.queue([]);var viewportHeight=parseInt($(window).height());var pageScroll=parseInt($(document).scrollTop());var parentTop=parseInt(box.cont.offset().top);var parentHeight=parseInt(box.cont.attr('offsetHeight'));var boxHeight=parseInt(box.attr('offsetHeight')+(parseInt(box.css('marginTop'))||0)+(parseInt(box.css('marginBottom'))||0));var aniTop;if(isActive){if(options.relativeTo=='top'){if(box.initialOffsetTop>=(pageScroll+options.offset)){aniTop=box.initialTop}else{aniTop=Math.min((Math.max((-parentTop),(pageScroll-box.initialOffsetTop+box.initialTop))+options.offset),(parentHeight-boxHeight-box.paddingAdjustment))}}else if(options.relativeTo=='bottom'){if((box.initialOffsetTop+boxHeight)>=(pageScroll+options.offset+viewportHeight)){aniTop=box.initialTop}else{aniTop=Math.min((pageScroll+viewportHeight-boxHeight-options.offset),(parentHeight-boxHeight))}}if((new Date().getTime()-box.lastScroll)>=(options.delay-20)){box.animate({top:aniTop},options.speed,options.easing)}}};var isActive=true;if($.cookie!=undefined){if($.cookie('scrollFollowSetting'+box.attr('id'))=='false'){var isActive=false;$('#'+options.killSwitch).text(options.offText).toggle(function(){isActive=true;$(this).text(options.onText);$.cookie('scrollFollowSetting'+box.attr('id'),true,{expires:365,path:'/'});ani()},function(){isActive=false;$(this).text(options.offText);box.animate({top:box.initialTop},options.speed,options.easing);$.cookie('scrollFollowSetting'+box.attr('id'),false,{expires:365,path:'/'})})}else{$('#'+options.killSwitch).text(options.onText).toggle(function(){isActive=false;$(this).text(options.offText);box.animate({top:box.initialTop},0);$.cookie('scrollFollowSetting'+box.attr('id'),false,{expires:365,path:'/'})},function(){isActive=true;$(this).text(options.onText);$.cookie('scrollFollowSetting'+box.attr('id'),true,{expires:365,path:'/'});ani()})}}if(options.container==''){box.cont=box.parent()}else{box.cont=$('#'+options.container)}box.initialOffsetTop=parseInt(box.offset().top);box.initialTop=parseInt(box.css('top'))||0;if(box.css('position')=='relative'){box.paddingAdjustment=parseInt(box.cont.css('paddingTop'))+parseInt(box.cont.css('paddingBottom'))}else{box.paddingAdjustment=0}$(window).scroll(function(){$.fn.scrollFollow.interval=setTimeout(function(){ani()},options.delay);box.lastScroll=new Date().getTime()});$(window).resize(function(){$.fn.scrollFollow.interval=setTimeout(function(){ani()},options.delay);box.lastScroll=new Date().getTime()});box.lastScroll=0;ani()};$.fn.scrollFollow=function(options){options=options||{};options.relativeTo=options.relativeTo||'top';options.speed=options.speed||500;options.offset=options.offset||0;options.easing=options.easing||'swing';options.container=options.container||this.parent().attr('id');options.killSwitch=options.killSwitch||'killSwitch';options.onText=options.onText||'Turn Slide Off';options.offText=options.offText||'Turn Slide On';options.delay=options.delay||0;this.each(function(){new $.scrollFollow(this,options)});return this}})(jQuery);