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 SwitchAnswer(qid){
	var ans_node=document.getElementById('ans_'+qid);
	if(ans_node.style.display=="none") ans_node.style.display="block";
	else ans_node.style.display="none";
}