(function($){$.fn.scrollFix=function(options){return this.each(function(){var opts=$.extend({},$.fn.scrollFix.defaultOptions,options);var obj=$(this),base=this,selfTop=0,selfLeft=0,toTop=0,parentOffsetLeft=0,parentOffsetTop=0,outerHeight,outerWidth,objWidth=0,placeholder=jQuery('<div>'),optsTop=opts.distanceTop,endfix=0;var originalPosition;var originalOffsetTop;var originalZIndex;var lastOffsetLeft=-1;var isUnfixed=true;if(obj.length<=0){return;}
if(lastOffsetLeft==-1){originalZIndex=obj.css('z-index');position=obj.css('position');originalPosition=obj.css('position');originalOffsetTop=obj.css('top');}
var zIndex=obj.css('zIndex');if(opts.zIndex!=0){zIndex=opts.zIndex;}
var parents=obj.parent();var Position=parents.css('position');while(!/^relative|absolute$/i.test(Position)){parents=parents.parent();Position=parents.css('position');if(/^body|html$/i.test(parents[0].tagName))break;}
var ie6=!-[1,]&&!window.XMLHttpRequest;var resizeWindow=false;function resetScroll(){setUnfixed();selfTop=obj.offset().top;selfLeft=obj.offset().left;outerHeight=obj.outerHeight();outerHeight=parseFloat(outerHeight)+parseFloat(obj.css('marginBottom').replace(/auto/,0));outerWidth=obj.outerWidth();objWidth=obj.width();var documentHeight=$(document).height();var startTop=$(opts.startTop),startBottom=$(opts.startBottom),toBottom,ScrollHeight;if(/^body|html$/i.test(parents[0].tagName)){parentOffsetTop=0,parentOffsetLeft=0;}else{parentOffsetLeft=parents.offset().left,parentOffsetTop=parents.offset().top;}
var bodyToTop=parseInt(jQuery('body').css('top'),10);if(!isNaN(bodyToTop)){optsTop+=bodyToTop;}
if(!isNaN(opts.endPos)){toBottom=opts.endPos;}else{toBottom=parseFloat(documentHeight-$(opts.endPos).offset().top);}
ScrollHeight=parseFloat(documentHeight-toBottom-optsTop),endfix=parseFloat(ScrollHeight-outerHeight);if(startTop[0]){var startTopOffset=startTop.offset(),startTopPos=startTopOffset.top;selfTop=startTopPos;}
if(startBottom[0]){var startBottomOffset=startBottom.offset(),startBottomPos=startBottomOffset.top,startBottomHeight=startBottom.outerHeight();selfTop=parseFloat(startBottomPos+startBottomHeight);}
toTop=selfTop-optsTop;toTop=(toTop>0)?toTop:0;var selfBottom=documentHeight-selfTop-outerHeight;if((toBottom!=0)&&(selfBottom<=toBottom)){return;}}
function setUnfixed(){if(!isUnfixed){lastOffsetLeft=-1;placeholder.css("display","none");obj.css({'z-index':originalZIndex,'width':'','position':originalPosition,'left':'','top':originalOffsetTop,'margin-left':''});obj.removeClass('scrollfixed');isUnfixed=true;}}
function onScroll(){lastOffsetLeft=1;var ScrollTop=$(window).scrollTop();if(opts.bottom!=-1){ScrollTop=ScrollTop+$(window).height()-outerHeight-opts.bottom;}
if(ScrollTop>toTop&&(ScrollTop<endfix)){if(ie6){obj.addClass(opts.baseClassName).css({"z-index":zIndex,"position":"absolute","top":opts.bottom==-1?ScrollTop+optsTop-parentOffsetTop:ScrollTop-parentOffsetTop,"bottom":'auto',"left":selfLeft-parentOffsetLeft,'width':objWidth})}else{obj.addClass(opts.baseClassName).css({"z-index":zIndex,"position":"fixed","top":opts.bottom==-1?optsTop:'',"bottom":opts.bottom==-1?'':opts.bottom,"left":selfLeft,"width":objWidth});}
placeholder.css({'height':outerHeight,'width':outerWidth,'display':'block'}).insertBefore(obj);}else if(ScrollTop>=endfix){obj.addClass(opts.baseClassName).css({"z-index":zIndex,"position":"absolute","top":endfix-parentOffsetTop+optsTop,'bottom':'',"left":selfLeft-parentOffsetLeft,"width":objWidth});placeholder.css({'height':outerHeight,'width':outerWidth,'display':'block'}).insertBefore(obj)}else{obj.removeClass(opts.baseClassName).css({"z-index":originalZIndex,"position":"static","top":"","bottom":"","left":""});placeholder.remove()}}
var Timer=0;resetScroll();$(window).on("scroll",function(){if(Timer){clearTimeout(Timer);}
Timer=setTimeout(onScroll,0);});$(window).on("resize",function(){if(Timer){clearTimeout(Timer);}
Timer=setTimeout(function(){isUnfixed=false;resetScroll();onScroll();},0);});})}
$.fn.scrollFix.defaultOptions={startTop:null,startBottom:null,distanceTop:0,endPos:0,bottom:-1,zIndex:0,baseClassName:'scrollfixed'};})(jQuery);