function externalLinks() { 
 if (!document.getElementsByTagName) return; 
 var anchors = document.getElementsByTagName("a"); 
 for (var i=0; i<anchors.length; i++) { 
   var anchor = anchors[i]; 
   if (anchor.getAttribute("href") && 
       anchor.getAttribute("rel") == "external") 
     anchor.target = "_blank"; 
 } 
} 
window.onload = externalLinks;



function showHide (i, action)
{
 var desc = document.getElementById (i) ;
 if (desc)
 {
  if (action == "1")
  {
   desc.style.visibility = 'visible' ;
  }
  else
  {
   desc.style.visibility = 'hidden' ;
  }
 }
}


function displayProp (i)
{
 var desc = document.getElementById (i) ;
 if (desc)
 {
  if (desc.style.visibility == 'visible')
  {
   desc.style.visibility = 'hidden' ;
  }
  else //if (desc.style.visibility == 'hidden')
  {
   desc.style.visibility = 'visible' ;
  }
 }
}