var rect1:Rectangle = new Rectangle(0, 0, 792,612);

prntCover_btn.addEventListener(MouseEvent.CLICK, printCover);

function printCover(evt:MouseEvent):void {
    front_mc.visible = false;
    	var myPrintJob:PrintJob = new PrintJob();
    	var options:PrintJobOptions = new PrintJobOptions();
    	options.printAsBitmap = true;
    	front_mc.scaleX = 1;
    	front_mc.scaleY = 1;
    	myPrintJob.start();
    	myPrintJob.addPage(front_mc, rect1, options);
    	myPrintJob.send();

    }

var margin_height:Number = (myPrintJob.paperHeight - myPrintJob.pageHeight)/2;
var margin_width:Number = (myPrintJob.paperWidth - myPrintJob.pageWidth)/2;

var myPrintJob:PrintJob = new PrintJob();
var options:PrintJobOptions = new PrintJobOptions();
options.printAsBitmap = true;
front_mc.scaleX = 1;
front_mc.scaleY = 1;
myPrintJob.start();

var marginWidth:Number = (myPrintJob.pageWidth - front_mc.width) / 2;
var marginHeight:Number = (myPrintJob.pageHeight- front_mc.height) / 2;
var rect:Rectangle = new Rectangle(-marginWidth, -marginHeight, myPrintJob.pageWidth, myPrintJob.pageHeight);

myPrintJob.addPage(front_mc, rect1, options);
myPrintJob.send();