//
// ============================
//  file name : common.js
//  author : staff015
// ============================
//

/////////////////////////////////////////////////////////////////////////////////////////

// smartScroll 1.7
function smartScroll ()
{	
	var allLinks = new Array();
	var as = document.getElementsByTagName('a');
	var areas = document.getElementsByTagName('area');
	for (var i=0; i<as.length; i++){
		allLinks.push(as[i]);
	}
	for (var i=0; i<areas.length; i++){
		allLinks.push(areas[i]);
	}
	
	for (var i=0;i<allLinks.length;i++)
	{
		var lnk = allLinks[i];
		
		if ((lnk.href && lnk.href.indexOf('#') != -1) && ((lnk.pathname == location.pathname) || ('/'+lnk.pathname == location.pathname)))
		{
			var myHash = lnk.hash.replace(/#/g,"");
			if (!(myHash.length == 0)) //hrefが"#"だった場合は処理を中止
			{
				lnk.onclick = function ()
				{
					//移動先のid名を取得
					var hash = this.hash;
					var targetId = hash.replace(/#/g,"");
				
					if (!document.getElementById(targetId)) return;
					
					//移動先の位置（y座標）
					if (document.all)
					{
						var element = document.getElementById(targetId);
						var targetY = 0;
						do
						{
							targetY += element.offsetTop || 0;
						} while (element = element.offsetParent);
					} else {
						var targetY = document.getElementById(targetId).offsetTop;
					}
					
					var scrollTop = document.body.parentNode.scrollTop || window.pageYOffset || document.body.scrollTop; //現在の表示位置（y座標）
					
					//スクール量の調整			
					var windowHeight = window.innerHeight || document.documentElement.clientHeight; //ウィンドウの高さ	
					var bodyHeight = document.body.offsetHeight; //bodyの高さ
					var footHeight = bodyHeight - targetY;
					var adjust = windowHeight - footHeight;
						
					//移動距離を計算
					if (windowHeight > footHeight)
					{				
						var toY = targetY - scrollTop - adjust;
					} else
					{
						var toY = targetY - scrollTop;
					}
					
					function windowScroll ()
					{
						var moveY = Math.floor(toY*.2);					
						window.scrollBy(0,moveY);
						toY -= moveY; 
						myTimer = setTimeout(windowScroll,30);
						if (moveY == 0) clearTimeout(myTimer);
					}								
					windowScroll();	
					return false;
				};
			}
		}
	}	
}

/////////////////////////////////////////////////////////////////////////////////////////

function init(){
	smartScroll();
}

//addLoadEvent
function addLoadEvent(func) {
	if (typeof window.addEventListener == 'function') {
		window.addEventListener('load', func, false);
		return true;
	} else if (typeof window.attachEvent == 'object') {
		window.attachEvent('onload', func);
		return true;
	}
	
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	} else {
		window.onload = function() {
			oldonload();
			func();
		}
	}
}

addLoadEvent(init);