var sWnd;
function login_pop(domain_location){
  if(sWnd){
    sWnd.close();
  }
  	sWnd = window.open(domain_location+"/master/my_login.htm","","resizable=yes,scrollbars=yes,width=660,height=558");
	  if((document.window != null) && (!sWnd.opener)){
    sWnd.opener = document.window;
	}
}