/**
 * @author lurenfake
 * @link http://www.lurenfake.com
 * 2010-12-12
 */
$.fn.extend({goToTop:function(b){var b=$.extend({pageWidth:940,pageWGap:10,pageHGap:30,startline:20,duration:200,showBtntime:100},b);var e=$(this);var f=$(window);var d=(window.opera)?(document.compatMode=="CSS1Compat"?$("html"):$("body")):$("html,body");var c=!($.browser.msie&&parseFloat($.browser.version)<7);var a=false;e.css({opacity:0,position:(c?"fixed":"absolute")});e.click(function(g){d.stop().animate({scrollTop:0},b.duration);e.blur();g.preventDefault();g.stopPropagation()});f.bind("scroll resize",function(i){var h;if(f.width()>b.pageHGap*2+b.pageWidth){h=(f.width()-b.pageWidth)/2+b.pageWidth+b.pageWGap}else{h=f.width()-b.pageWGap-e.width()}var j=f.height()-e.height()-b.pageHGap;j=c?j:f.scrollTop()+j;e.css({left:h+"px",top:j+"px"});var g=(f.scrollTop()>=b.startline)?true:false;if(g&&!a){e.stop().animate({opacity:1},b.showBtntime);a=true}else{if(a&&!g){e.stop().animate({opacity:0},b.showBtntime);a=false}}})}});