function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {

		mxover = newImage("img/joystick_pointer-on.gif");
		preloadFlag = true;
	}
}

function launchCenter(url, name, width, height, especs) {
  //alert(navigator.appName+'-'+navigator.appVersion);
  if (document.all && navigator.appName!='Opera') height=height-20;
  var str = "height=" + height + ",innerHeight=" + height;
  str += ",width=" + width + ",innerWidth=" + width;
  if (window.screen) {
    var ah = screen.availHeight - 30;
    var aw = screen.availWidth - 10;

    var xc = (aw - width) / 2;
    var yc = (ah - height) / 2;

    str += ",left=" + xc + ",screenX=" + xc;
    str += ",top=" + yc + ",screenY=" + yc;
  } else {
	str += ",resizable";
  }
  str+=especs;
  return window.open(url, name, str);
}