function popup(width, height) {
                if (window.innerWidth) {
                    LeftPosition = (window.innerWidth - width) / 2;
                    TopPosition = ((window.innerHeight - height) / 4) - 50;
                }
                else {
                    LeftPosition = (parseInt(window.screen.width) - width) / 2;
                    TopPosition = ((parseInt(window.screen.height) - height) / 2) - 50;
                }
                attr = 'resizable=no,scrollbars=yes,width=' + width + ',height=' +
	    height + ',screenX=300,screenY=200,left=' + LeftPosition + ',top=' +
	    TopPosition + '';
                popWin = open('', 'new_window', attr);
                popWin.document.write('<div align="center"><img src="images/Smithers Certificate 2012.jpg" alt="Smithers Certificate" /></div>');
            }