Open new popup window and maximize it.

gistfile1.js

var w = window.open(jQuery(this).attr('href'), 'real-size-photo', 'width=500,height=500');

w.moveTo(0, 0);
if (document.all) {
  w.resizeTo(screen.availWidth, screen.availHeight);
}
else {
  if (document.layers || document.getElementById) {
    if (w.outerHeight < screen.availHeight || w.outerWidth < screen.availWidth) {
      w.outerHeight = top.screen.availHeight;
      w.outerWidth = top.screen.availWidth;
    }
  }
}