mxPrintPreview.prototype.getAppendices=function(){return null};mxPrintPreview.prototype.print=function(a){a=this.open(a);null!=a&&a.print()};mxPrintPreview.prototype.close=function(){null!=this.wnd&&(this.wnd.close(),this.wnd=null)};function mxStylesheet(){this.styles={};this.putDefaultVertexStyle(this.createDefaultVertexStyle());this.putDefaultEdgeStyle(this.createDefaultEdgeStyle())}