// JavaScript Document
fd = new Object();
fd.onLoad = function(e) {
	for(var module in this) {
		if(this[module].onLoad) this[module].onLoad();
	}
}
fd.getDocumentHeight = function(){
	return (document.height) ? document.height : (document.body.offsetHeight) ? document.body.offsetHeight : 0;
}
fd.getWindowHeight = function(){
	var myHeight = 0;
	if( typeof( window.innerWidth ) == 'number' ) {
		//Non-IE
		myHeight = window.innerHeight;
	} else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
		//IE 6+ in 'standards compliant mode'
		myHeight = document.documentElement.clientHeight;
	} else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
		//IE 4 compatible
		myHeight = document.body.clientHeight;
	}
	return myHeight;
}
fd.getScrollTop = function(){
	if(document.all) return (document.documentElement.scrollTop) ? document.documentElement.scrollTop : document.body.scrollTop;
	else return window.pageYOffset;
}
fd.getElementYpos = function(el){
	var y = 0;
	while(el.offsetParent){
		y += el.offsetTop
		el = el.offsetParent;
	}
	return y;
}
/*
Based on an original script by Travis Beckham (http://www.squidfingers.com)
Wrapped into an Object by yours truly
Further enhancements and bug fixs by Marco Rosella (http://www.centralscrutinizer.it)
*/
fd.pageScroller = {
	speed : 25,
	maxStep: 100,
	brakeK: 4,
	hash:null,
	currentBlock:null,
	requestedY:0,
        
	onLoad: function() {
		var lnks = document.getElementsByTagName('a');
		for(var i = 0, lnk; lnk = lnks[i]; i++) {
			if ((lnk.href && lnk.href.indexOf('#') != -1) &&  ( (lnk.pathname == location.pathname) || ('/'+lnk.pathname == location.pathname) ) && (lnk.search == location.search) && lnk.className.search('no-scroll') == -1) {
				lnk.onclick = fd.pageScroller.initScroll;
			}
		}
	},
	initScroll: function(e){
		var targ;
		if (!e) var e = window.event;
		if (e.target) targ = e.target;
		else if (e.srcElement) targ = e.srcElement;
		// Added by f.d: make sure we actually have the A node and a child tag like span or img
		while(targ.tagName.toUpperCase() != "A" && targ.parentNode) targ = targ.parentNode;
                
		fd.pageScroller.hash = targ.href.substr(targ.href.indexOf('#')+1,targ.href.length);
		fd.pageScroller.currentBlock = document.getElementById(fd.pageScroller.hash);

		if(!fd.pageScroller.currentBlock) return;
		fd.pageScroller.requestedY = fd.getElementYpos(fd.pageScroller.currentBlock) - 30;
		/*@cc_on@*/
		/*@if(@_jscript_version < 6)
			fd.pageScroller.requestedY += 30;
		/*@end@*/
		if(fd.pageScroller.requestedY < 0) fd.pageScroller.requestedY = 0;

		fd.pageScroller.scroll();
		return false;
	},
	scroll: function(){
		var top  = fd.getScrollTop();

		if(fd.pageScroller.requestedY > top) {
			var endDistance = Math.round((fd.getDocumentHeight() - (top + fd.getWindowHeight())) / fd.pageScroller.brakeK);
			endDistance = Math.min(Math.round((fd.pageScroller.requestedY-top)/ fd.pageScroller.brakeK), endDistance);
			var offset = Math.max(2, Math.min(endDistance, fd.pageScroller.maxStep));
		} else {
			var offset = - Math.min(Math.abs(Math.round((fd.pageScroller.requestedY-top)/ fd.pageScroller.brakeK)), fd.pageScroller.maxStep);
		}
		window.scrollTo(0, top + offset);
		if(Math.abs(top-fd.pageScroller.requestedY) <= 1 || fd.getScrollTop() == top) {
			window.scrollTo(0, fd.pageScroller.requestedY);
			location.hash = fd.pageScroller.hash;
			fd.pageScroller.hash = null;
		} else {
			setTimeout(fd.pageScroller.scroll,fd.pageScroller.speed);
		}
	}
}

var hoge_scripts = window.onload;
window.onload = function() {
	if(hoge_scripts != null) hoge_scripts();
	fd.onLoad();
}