/*==============================================
	scrollsmoothly
	Copyright (c) 2008 KAZUMiX
	http://d.hatena.ne.jp/KAZUMiX/
	Licensed under the MIT License:
	http://www.opensource.org/licenses/mit-license.php
==============================================*/
(function(){
	var easing = 0.25;
	var interval = 20;
	var d = document;
	var targetX = 0;
	var targetY = 0;
	var targetHash = '';
	var scrolling = false;
	var splitHref = location.href.split('#');
	var currentHref_WOHash = splitHref[0];
	var incomingHash = splitHref[1];
	var prevX = null;
	var prevY = null;
	addEvent(window, 'load', init);
	function init(){
		setOnClickHandler();
		if(incomingHash){
			if(window.attachEvent && !window.opera){
				setTimeout(function(){scrollTo(0,0);setScroll('#'+incomingHash);},50);
			}else{
				scrollTo(0, 0);
				setScroll('#'+incomingHash);
			}
		}
	}
	function addEvent(eventTarget, eventName, func){
		if(eventTarget.addEventListener){
			eventTarget.addEventListener(eventName, func, false);
		}else if(window.attachEvent){
			eventTarget.attachEvent('on'+eventName, function(){func.apply(eventTarget);});
		}
	}
	function setOnClickHandler(){
		var links = d.links;
		for(var i=0; i<links.length; i++){
			var link = links[i];
			var splitLinkHref = link.href.split('#');
			if(currentHref_WOHash == splitLinkHref[0] && d.getElementById(splitLinkHref[1])){
				addEvent(link, 'click', startScroll);
			}
		}
	}
	function startScroll(event){
		if(event){
			event.preventDefault();
		}else if(window.event){
			window.event.returnValue = false;
		}
		setScroll(this.hash);
	}
	function setScroll(hash){
		var targetEle = d.getElementById(hash.substr(1));
		if(!targetEle)return;
		var ele = targetEle
		var x = 0;
		var y = 0;
		while(ele){
			x += ele.offsetLeft;
			y += ele.offsetTop;
			ele = ele.offsetParent;
		}
		targetX = x;
		targetY = y;
		targetHash = hash;
		if(!scrolling){
			scrolling = true;
			scroll();
		}
	}
	function scroll(){
		var currentX = d.documentElement.scrollLeft||d.body.scrollLeft;
		var currentY = d.documentElement.scrollTop||d.body.scrollTop;
		var vx = (targetX - currentX) * easing;
		var vy = (targetY - currentY) * easing;
		var nextX = currentX + vx;
		var nextY = currentY + vy;
		if((Math.abs(vx) < 1 && Math.abs(vy) < 1) || (prevX === currentX && prevY === currentY)){
			scrollTo(targetX, targetY);
			scrolling = false;
			location.hash = targetHash;
			prevX = prevY = null;
			return;
		}else{
			scrollTo(parseInt(nextX), parseInt(nextY));
			prevX = currentX;
			prevY = currentY;
			var scope = this;
			setTimeout(function(){scroll.apply(scope)},interval);
		}
	}
}());

/*==============================================
	New window Module
==============================================*/
$( function() {
	$('a.blank').click(function(){
		window.open( this.href, '_blank' );
		return false;
	});
});

/*==============================================
	Swap image Module
==============================================*/
$(function() {
	var image_cache = new Object();
	$("img.swap").not("[@src*='_ovr.']").each(function(i) {
		var imgsrc = this.src;
		var dot = this.src.lastIndexOf('.');
		var imgsrc_ovr = this.src.substr(0, dot) + '_ovr' + this.src.substr(dot, 4);
		image_cache[this.src] = new Image();
		image_cache[this.src].src = imgsrc_ovr;
		$(this).hover(function() {
			this.src = imgsrc_ovr;
		}, function() {
			this.src = imgsrc;
		});
	});
});

/*==============================================
	Selector Behavior
==============================================*/
$(function() {
	$('div#topicPath ul li:last').css('background', 'none');
	$('div#contents div#studyMethod.eta ul li img:last').css('margin', '0');
	$('div#contents dl.faq:last').css('margin', '0');
	$('div#contents dl.faq:last').css('padding', '0');
	$('div#contents dl.faq:last').css('border-bottom', 'none');
});

/**
 * jQuery (PNG Fix) v1.2
 * Microsoft Internet Explorer 24bit PNG Fix
 *
 * The MIT License
 * 
 * Copyright (c) 2007 Paul Campbell (pauljamescampbell.co.uk)
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @param		Object
 * @return		Array
 */
(function($) {
	
	$.fn.pngfix = function(options) {
		
		// Review the Microsoft IE developer library for AlphaImageLoader reference 
		// http://msdn2.microsoft.com/en-us/library/ms532969(VS.85).aspx
		
		// ECMA scope fix
		var elements 	= this;
		var settings 	= $.extend({
			imageFixSrc: 	false,
			sizingMethod: 	false 
		}, options);
		
		if(!$.browser.msie || ($.browser.msie &&  $.browser.version >= 7)) {
			return(elements);
		}

		function setFilter(el, path, mode) {
			var fs = el.attr("filters");
			var alpha = "DXImageTransform.Microsoft.AlphaImageLoader";
			if (fs[alpha]) {
				fs[alpha].enabled = true;
				fs[alpha].src = path; 
				fs[alpha].sizingMethod = mode;
			} else {
				el.css("filter", 'progid:' + alpha + '(enabled="true", sizingMethod="' + mode + '", src="' + path + '")');			
			}
		}
		
		function setDOMElementWidth(el) {
			if(el.css("width") == "auto" & el.css("height") == "auto") {
				el.css("width", el.attr("offsetWidth") + "px");
			}
		}

		return(
			elements.each(function() {
				
				// Scope
				var el = $(this);
				
				if(el.attr("tagName").toUpperCase() == "IMG" && (/\.png/i).test(el.attr("src"))) {
					if(!settings.imageFixSrc) {
						
						// Wrap the <img> in a <span> then apply style/filters, 
						// removing the <img> tag from the final render 
						el.wrap("<span></span>");
						var par = el.parent();
						par.css({
							height: 	el.height(),
							width: 		el.width(),
							display: 	"inline-block"
						});
						setFilter(par, el.attr("src"), "scale");
						el.remove();
					} else if((/\.gif/i).test(settings.imageFixSrc)) {
						
						// Replace the current image with a transparent GIF
						// and apply the filter to the background of the 
						// <img> tag (not the preferred route)
						setDOMElementWidth(el);
						setFilter(el, el.attr("src"), "image");
						el.attr("src", settings.imageFixSrc);
					}
					
				} else {
					var bg = new String(el.css("backgroundImage"));
					var matches = bg.match(/^url\("(.*)"\)$/);
					if(matches && matches.length) {
						
						// Elements with a PNG as a backgroundImage have the
						// filter applied with a sizing method relevant to the 
						// background repeat type
						setDOMElementWidth(el);
						el.css("backgroundImage", "none");
						
						// Restrict scaling methods to valid MSDN defintions (or one custom)
						var sc = "crop";
						if(settings.sizingMethod) {
							sc = settings.sizingMethod;
						} 
						setFilter(el, matches[1], sc);
						
						// Fix IE peek-a-boo bug for internal links
						// within that DOM element
						el.find("a").each(function() {
							$(this).css("position", "relative");
						});
					}
				}
				
			})
		);
	}

})(jQuery)

jQuery(function($) {
	$('.af').pngfix();
});