// Function to give big screen

function bigScreen() {
  xoff = 0; yoff = 0;
  xs = screen.availWidth;
  ys = screen.availHeight;
  if (xs >= 800) {
    xs = 800; yoff = (window.screenWidth - 800) / 2;
    }
  if (ys >= 600) {
    ys = 600; yoff = (window.screenWidth - 600) / 2;
    }
  window.moveTo(xoff, yoff);
  window.resizeTo(xs, ys);
  }

function fullScreen() {
  xs = screen.availWidth;
  ys = screen.availHeight;
  window.resizeTo(xs, ys);
  }