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(ele) {
    var srcElement = document.getElementById(ele);
    if(srcElement != null) {
    if(srcElement.style.display == "block") {
       srcElement.style.display= 'none';
    }
    else {
       srcElement.style.display='block';
    }
    return false;
  }
 
  }