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;


//funtion to change image previews
function showPic (whichpic) {
 if (document.getElementById) {
  document.getElementById('themepreview').src = whichpic.href;
  if (whichpic.title) {
   document.getElementById('desc').childNodes[0].nodeValue = whichpic.title;
  } 
  return false;
 } else {
  return true;
 }
}