var c2cframe = null;
function openClickToCallFrame(userID, buttonID) {
  if(c2cframe != null) {
    if(!c2cframe.closed) {
      c2cframe.close();
    }
  }
  c2cframe = open("http://www.click-to-call.net:80/callback/callbackinitiation.do" + 
                  "?NEW=NEW" + 
                  "&UserID=" + userID + 
                  "&BUTTONID=" + buttonID 
                +  "&DESIGN=NEUTRAL"  
            //  +  "&Locale=de"
            //  +  "&Locale=en"
            //  +  "&Locale=fr"
                 , "ClickToCallFrame", "width=275,height=360,resizable=yes,left=50,top=50");
  return false;
}