var scrolltotop={setting: {startline:100, scrollto: 0, scrollduration:1000, fadeduration:[500, 100]},
controlHTML: '<img src="images/logo/up.png" style="width:32px; height:32px" />',
controlattrs: {offsetx:10, offsety:5},
anchorkeyword: '#top',
state: {isvisible:false , shouldvisible:false },
scrollup:function(){if (!this.cssfixedsupport) 
this.$control.css({opacity:0})
var dest=isNaN(this.setting.scrollto)? this.setting.scrollto : parseInt(this.setting.scrollto)
if (typeof dest=="string" && jQuery('#'+dest).length==1)
dest=jQuery('#'+dest).offset().top
else
dest=0
this.$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
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()!='')
mainobj.$control.css({width:mainobj.$control.width()})
mainobj.togglecontrol()
$('a[href="' + mainobj.anchorkeyword +'"]').click(function(){mainobj.scrollup()
return false })
$(window).bind('scroll resize', function(e){mainobj.togglecontrol()})})}}
scrolltotop.init()