//** 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: '', //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=$('