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d=Element.cumulativeScrollOffset(a);this.xcomp=b+d[0]-this.deltaX,this.ycomp=c+d[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(a,b){if(!a)return 0;if(a=="vertical")return(this.offset[1]+b.offsetHeight-this.ycomp)/b.offsetHeight;if(a=="horizontal")return(this.offset[0]+b.offsetWidth-this.xcomp)/b.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(a,b,c){c=c||{};return Element.clonePosition(b,a,c)}};document.getElementsByClassName||(document.getElementsByClassName=function(a){function b(a){return a.blank()?null:"[contains(concat(' ', @class, ' '), ' "+a+" ')]"}a.getElementsByClassName=Prototype.BrowserFeatures.XPath?function(a,c){c=c.toString().strip();var d=/\s/.test(c)?$w(c).map(b).join(""):b(c);return d?document._getElementsByXPath(".//*"+d,a):[]}:function(a,b){b=b.toString().strip();var c=[],d=/\s/.test(b)?$w(b):null;if(!d&&!b)return c;var e=$(a).getElementsByTagName("*");b=" "+b+" ";for(var f=0,g,h;g=e[f];f++)g.className&&(h=" "+g.className+" ")&&(h.include(b)||d&&d.all(function(a){return!a.toString().blank()&&h.include(" "+a+" ")}))&&c.push(Element.extend(g));return c};return function(a,b){return $(b||document.body).getElementsByClassName(a)}}(Element.Methods)),Element.ClassNames=Class.create(),Element.ClassNames.prototype={initialize:function(a){this.element=$(a)},_each:function(a){this.element.className.split(/\s+/).select(function(a){return 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