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 toggle_dd(id){
	var ddstr = "dd"+id
	var imstr = "im"+id
	var oDd = document.getElementById(ddstr);
	var oImg = document.getElementById(imstr);

	if(oDd.style.display == "none"){
		//oDd.style.display = "block";
		oImg.src = "img/minus.gif";
		oImg.alt = "zabalit";
		oImg.title = "zabalit";
	}
	else{
		//oDd.style.display = "none";
		oImg.src = "img/plus.gif";
		oImg.alt = "rozbalit";
		oImg.title = "rozbalit";
	}
}
*/