function toggle_visibility(id) {
       var e = document.getElementById(id);
       if(e.style.display == 'block')
          e.style.display = 'none';
       else
          e.style.display = 'block';
}

function popWindow(wName){
	      features = 'width=660,height=900,toolbar=no,location=no,directories=no,menubar=no,scrollbars=yes,copyhistory=no,resizable=no';
	      pop = window.open('',wName,features);
	      if(pop.focus){ pop.focus(); }
	      return true;
}