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instead'),Position={includeScrollOffsets:false,prepare:function(){this.deltaX=window.pageXOffset||document.documentElement.scrollLeft||document.body.scrollLeft||0;this.deltaY=window.pageYOffset||document.documentElement.scrollTop||document.body.scrollTop||0},within:function(a,b,c){if(this.includeScrollOffsets)return this.withinIncludingScrolloffsets(a,b,c);this.xcomp=b;this.ycomp=c;this.offset=Element.cumulativeOffset(a);return c>=this.offset[1]&&c<this.offset[1]+a.offsetHeight&&b>=this.offset[0]&&b<this.offset[0]+a.offsetWidth},withinIncludingScrolloffsets:function(a,c,d){var b=Element.cumulativeScrollOffset(a);this.xcomp=c+b[0]-this.deltaX;this.ycomp=d+b[1]-this.deltaY;this.offset=Element.cumulativeOffset(a);return this.ycomp>=this.offset[1]&&this.ycomp<this.offset[1]+a.offsetHeight&&this.xcomp>=this.offset[0]&&this.xcomp<this.offset[0]+a.offsetWidth},overlap:function(b,a){if(!b)return 0;if(b=="vertical")return (this.offset[1]+a.offsetHeight-this.ycomp)/a.offsetHeight;if(b=="horizontal")return (this.offset[0]+a.offsetWidth-this.xcomp)/a.offsetWidth},cumulativeOffset:Element.Methods.cumulativeOffset,positionedOffset:Element.Methods.positionedOffset,absolutize:function(a){Position.prepare();return Element.absolutize(a)},relativize:function(a){Position.prepare();return Element.relativize(a)},realOffset:Element.Methods.cumulativeScrollOffset,offsetParent:Element.Methods.getOffsetParent,page:Element.Methods.viewportOffset,clone:function(b,c,a){a=a||{};return Element.clonePosition(c,b,a)}};if(!document.getElementsByClassName)document.getElementsByClassName=function(b){function a(a){return a.blank()?null:"[contains(concat(' ', @class, ' '), ' "+a+" ')]"}b.getElementsByClassName=Prototype.BrowserFeatures.XPath?function(d,b){b=b.toString().strip();var c=/\s/.test(b)?$w(b).map(a).join(""):a(b);return c?document._getElementsByXPath(".//*"+c,d):[]}:function(g,a){a=a.toString().strip();var d=[],c=/\s/.test(a)?$w(a):null;if(!c&&!a)return d;var h=$(g).getElementsByTagName("*");a=" "+a+" ";for(var f=0,b,e;b=h[f];f++)if(b.className&&(e=" "+b.className+" ")&&(e.include(a)||c&&c.all(function(a){return !a.toString().blank()&&e.include(" "+a+" ")})))d.push(Element.extend(b));return d};return function(b,a){return $(a||document.body).getElementsByClassName(b)}}(Element.Methods);Element.ClassNames=Class.create();Element.ClassNames.prototype={initialize:function(a){this.element=$(a)},_each:function(a){this.element.className.split(/\s+/).select(function(a){return a.length>0})._each(a)},"set":function(a){this.element.className=a},add:function(a){if(this.include(a))return;this.set($A(this).concat(a).join(" "))},remove:function(a){if(!this.include(a))return;this.set($A(this).without(a).join(" "))},toString:function(){return $A(this).join(" ")}};Object.extend(Element.ClassNames.prototype,Enumerable);Element.addMethods()