function linkTo(linkData) {

  // window style
//  styles = linkData['styles'];
//  windowName = linkData['name'];
  // for demo
  windowName = ""
  styles = "width=640,height=480," +
           "left=640,screenX=640,top=100,screenY=100," +
           "scrollbars=yes,menubar=yes," +
           "toolbar=yes,location=yes,status=yes";

  // target set
  if (linkData['target'] == "_window") {
    window.open(linkData['href'], windowName, styles);
  }
  else if (linkData['target'] == "_blank") {
    window.open(linkData['href']);
  }
  else if (linkData['target'] == "_parent") {
    parent.location.href = linkData['href'];
  }
  else {
    location.href = linkData['href'];
  }

  return false;
}