//** jQuery Scroll to Top Control script- (c) Dynamic Drive DHTML code library: http://www.dynamicdrive.com.

//** Available/ usage terms at http://www.dynamicdrive.com (March 30th, 09')

//** v1.1 (April 7th, 09'):

//** 1) Adds ability to scroll to an absolute position (from top of page) or specific element on the page instead.

//** 2) Fixes scroll animation not working in Opera. 





var scrolltotop={

	//startline: Integer. Number of pixels from top of doc scrollbar is scrolled before showing control

	//scrollto: Keyword (Integer, or "Scroll_to_Element_ID"). How far to scroll document up when control is clicked on (0=top).

	setting: {startline:100, scrollto: 0, scrollduration:1000, fadeduration:[500, 100]},

	controlHTML: '<img src="http://somalilandhor.net/js/scrollup.png" style="width:100px; height:48px" />', //HTML for control, which is auto wrapped in DIV w/ ID="topcontrol"

	controlattrs: {offsetx:5, offsety:5}, //offset of control relative to right/ bottom of window corner

	anchorkeyword: '#top', //Enter href value of HTML anchors on the page that should also act as "Scroll Up" links



	state: {isvisible:false, shouldvisible:false},



	scrollup:function(){

		if (!this.cssfixedsupport) //if control is positioned using JavaScript

			this.$control.css({opacity:0}) //hide control immediately after clicking it

		var dest=isNaN(this.setting.scrollto)? this.setting.scrollto : parseInt(this.setting.scrollto)

		if (typeof dest=="string" && jQuery('#'+dest).length==1) //check element set by string exists

			dest=jQuery('#'+dest).offset().top

		else

			dest=0

		this.$body.animate({scrollTop: dest}, this.setting.scrollduration);

	},



	keepfixed:function(){

		var $window=jQuery(window)

		var controlx=$window.scrollLeft() + $window.width() - this.$control.width() - this.controlattrs.offsetx

		var controly=$window.scrollTop() + $window.height() - this.$control.height() - this.controlattrs.offsety

		this.$control.css({left:controlx+'px', top:controly+'px'})

	},



	togglecontrol:function(){

		var scrolltop=jQuery(window).scrollTop()

		if (!this.cssfixedsupport)

			this.keepfixed()

		this.state.shouldvisible=(scrolltop>=this.setting.startline)? true : false

		if (this.state.shouldvisible && !this.state.isvisible){

			this.$control.stop().animate({opacity:1}, this.setting.fadeduration[0])

			this.state.isvisible=true

		}

		else if (this.state.shouldvisible==false && this.state.isvisible){

			this.$control.stop().animate({opacity:0}, this.setting.fadeduration[1])

			this.state.isvisible=false

		}

	},

	

	init:function(){

		jQuery(document).ready(function($){

			var mainobj=scrolltotop

			var iebrws=document.all

			mainobj.cssfixedsupport=!iebrws || iebrws && document.compatMode=="CSS1Compat" && window.XMLHttpRequest //not IE or IE7+ browsers in standards mode

			mainobj.$body=(window.opera)? (document.compatMode=="CSS1Compat"? $('html') : $('body')) : $('html,body')

			mainobj.$control=$('<div id="topcontrol">'+mainobj.controlHTML+'</div>')

				.css({position:mainobj.cssfixedsupport? 'fixed' : 'absolute', bottom:mainobj.controlattrs.offsety, right:mainobj.controlattrs.offsetx, opacity:0, cursor:'pointer'})

				.attr({title:'ページトップに戻る'})

				.click(function(){mainobj.scrollup(); return false})

				.appendTo('body')

			if (document.all && !window.XMLHttpRequest && mainobj.$control.text()!='') //loose check for IE6 and below, plus whether control contains any text

				mainobj.$control.css({width:mainobj.$control.width()}) //IE6- seems to require an explicit width on a DIV containing text

			mainobj.togglecontrol()

			$('a[href="' + mainobj.anchorkeyword +'"]').click(function(){

				mainobj.scrollup()

				return false

			})

			$(window).bind('scroll resize', function(e){

				mainobj.togglecontrol()

			})

		})

	}

}



scrolltotop.init()