function show_hide_all(new_state)
{
    var x=document.getElementsByName("pmid");
    for (var i = 0; i < x.length; i++)
        if (x[i].style.display != new_state)
            eval(jstree(x[i].id.substr(1)));
}
	
function jstree(id)
{
	var jstreeText = document.getElementById('k' + id);
	var jstreeObj = document.getElementById('pic' + id); 

	if (jstreeText.style.display == 'none') {
  		jstreeText.style.display = 'block';
  		jstreeObj.src = 'img/minus.gif';
	}
	else {
  		jstreeText.style.display = 'none';
  		jstreeObj.src = 'img/plus.gif';
	}
}

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;