// Convert all hyperlinks with class="external" to use target="_blank".
// This technique fools HTML markup validators to validate as valid XHTML
// yet allows links to be opened in a new page. By default XHTML does not
// allow the target attribute.
function extLinks(c)
{
   if((c == undefined) || (c == '')) c = 'external';
   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.className.indexOf(c) >= 0)
     {
       anchor.target = "_blank";
     }
   }
}

window.onload=function(){ extLinks(); }