copy from window javascript box..

Hello everybody,

I have a small javascript custom tool button that shows me the trim size of the pdf page.
Is this possible to copy the mesage alert (or if there is another type of window box) on clipboard after the window appears ?

Thank you.

function TrimSize(){

var aRect = this.getPageBox("Trim");
var width = aRect[2] - aRect[0];
var height = aRect[1] - aRect[3];

var rw =(width*0.3528).toFixed(1);
var rh = (height*0.3528).toFixed(1);
//___________________________________________


app.alert("Trim: " + rw + " mm x "+ rh + " mm"
);
}

app.addToolButton({
    cName: "Trim Size",
    cLabel: "Trim Size",
    cExec: "TrimSize()",
	cTooltext: "Trim Size",
    nPos: 0
	
});