var windowW = window.screen.availWidth * .6;
var windowH = window.screen.availHeight * 1;
var windowX = (window.screen.availWidth / 2) - (windowW/2);
var windowY = (window.screen.availHeight /2) - (windowH/2);


window.moveTo(windowX,windowY);
window.resizeTo(windowW, windowH);
window.focus();