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)});
}