function toggle_div(div_id, force) {
	var obj = document.getElementById(div_id);
	
	if (force == 'on') {
		obj.style.display = 'block';
	} else if (force == 'off') {
		obj.style.display = 'none';
	} else {
		if (obj.style.display == '' || obj.style.display == 'block') {
			obj.style.display = 'none';
		} else {
			obj.style.display = 'block';
		}
	}
}

function openWindow(url, title, x, y, h, w, centered) {
  if (centered == 1) {
    x = (screen.width - w) / 2;
    y = (screen.height - h) / 2;
  }
  
  newWindow = window.open(url, title, 'height=' + h + ',width=' + w + ',top=' + y + ',left=' + x + ',scrollbars=yes,location=no,toolbar=no,resizable=yes,menubar=no');
}