//** 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="images/float4-top.jpg"/>', //HTML for control, which is auto wrapped in DIV w/ ID="topcontrol"
    controlattrs: {offsetx:06, offsety:10}, //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)
        if (this.state.shouldvisible && !this.state.isvisible) {
            this.$control.stop().animate({opacity:1}, this.setting.fadeduration[0])
            this.state.isvisible = true
        }
        else if (!this.state.shouldvisible && this.state.isvisible) {
            this.$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 = $('<div id="topcontrol">' + mainobj.controlHTML + '</div>')
                    .css({position:mainobj.cssfixedsupport ? 'fixed' : 'absolute', bottom:mainobj.controlattrs.offsety, right:mainobj.controlattrs.offsetx, opacity:0, cursor:'pointer'})
                    .attr({title:'Scroll Back to Top'})
                    .click(function() {
                mainobj.scrollup();
                return false
            })
                    .appendTo('body')
            if (document.all && !window.XMLHttpRequest && mainobj.$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()