/*--------------------------------------------------------------------------*
 *  
 *  SmoothScroll JavaScript Library beta1
 *  
 *  MIT-style license. 
 *  
 *  2007 Kazuma Nishihata 
 *  http://www.webcreativepark.net
 *  
 *--------------------------------------------------------------------------*/

new function() {

	/*
	*イベント追加用
	-------------------------------------------------*/
	function addEvent(elm, listener, fn) {
		try { // IE
			elm.addEventListener(listener, fn, false);
		} catch (e) {
			elm.attachEvent(
				"on" + listener
				, function() {
					fn.apply(elm, arguments)
				}
			);
		}
	}

	/*
	*スムーズスクロール
	-------------------------------------------------*/
	function SmoothScroll(a) {
		if (document.getElementById(a.rel.replace(/.*\#/, ""))) {
			var e = document.getElementById(a.rel.replace(/.*\#/, ""));
		} else {
			return;
		}

		//移動位置
		var end = e.offsetTop
		//現在位置
		var start = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop || 0;

		var flag = (end < start) ? "up" : "down";

		function scrollMe(start, end, flag) {

			setTimeout(
				function() {
					if (flag == "up" && start >= end) {
						start = start - (start - end) / 20 - 1;
						window.scrollTo(0, start)
						arguments.callee(start, end, flag);

					} else if (flag == "down" && start <= end) {
						start = start + (end - start) / 20 + 1;

						window.scrollTo(0, start)
						arguments.callee(start, end, flag);

					} else {
						scrollTo(0, end);
					}
				}
				, 200
			);

		}
		scrollMe(start, end, flag)
	}

	/*
	*スムーズ変換スクリプト
	-------------------------------------------------*/
	addEvent(window, "load", function() {
		var anchors = document.getElementsByTagName("a");
		for (var i = 0; i < anchors.length; i++) {
			if (anchors[i].href.match(/\#www/i)) {
				if (anchors[i].href.replace(/\#[a-zA-Z0-9]+/, "") == location.href.replace(/\#[a-zA-Z0-9]+/, "")) {
					anchors[i].rel = anchors[i].href;
					anchors[i].href = "javascript:void(0)";
					anchors[i].onclick = function() { SmoothScroll(this) }
				}
				/* href の指定が "/ (サイトルート)" の時にも href が "javascript:void(0)" に書き換えられてしまうので "#www" だけに反応するように if 構文を追加 */
			}
		}
	});

}