function open_w(url, name, width, height, param) {
  
    var ah = screen.availHeight;
    var aw = screen.availWidth;

	var str = param + ",height=" + height + ",innerHeight=" + height;
  	str += ",width=" + width + ",innerWidth=" + width;
	
    var xc = (aw - width) / 2;
    var yc = (ah - height) / 2 + 15;

    str += ",left=" + xc + ",screenX=" + xc;
    str += ",top=" + yc + ",screenY=" + yc;

	window.open(url, name, str);
}