app.addToolButton({cName:"showtrimbox",cTooltext:"Trimbox",cExec:"showTrim()",cEnable:true,nPos:0,cLabel:"Trimbox"}); 
function showTrim() { 
	try { 
		app.removeToolButton({cName:"trimbox"}); 
	} catch(err){} 
	try { 
		var r=this.getPageBox("Trim",this.pageNum); 
		var h=(r[1]-r[3])/2.834647623697917; 
		var b=(r[2]-r[0])/2.834647623697917; 
	} catch(err) { return; } 
	app.addToolButton({cName:"trimbox",cTooltext:"Trimbox",cExec:"",cEnable:false,nPos:1,cLabel:util.printf("%,2.1f mm x %,2.1f mm",b,h)}); 
}