/*javascript for Bubble Tooltips by Alessandro Fulciniti
- http://pro.html.it - http://web-graphics.com
Slightly modified by Arnoud Klaren (see comments in text). Also
used more logical order of the functions and better indentation */

function enableTooltips(tagname,named){
  //AK: added optional tagname parameter
  //AK: changed parameter id to named
var e,i,h;

  if(!document.getElementsByName || !document.getElementsByTagName) return;

  //AK: only do initialization once
  if (document.getElementById("btc")==null) {
    AddCss();

    h=document.createElement("span");
    h.id="btc";
    h.setAttribute("id","btc");
    h.style.position="absolute";
    document.getElementsByTagName("body")[0].appendChild(h);
  }

  //AK: if tagname missing, use archors
  if(tagname==null) tagname="a";
  if(named==null) e=document.getElementsByTagName(tagname);
  else e=document.getElementsByName(named); //AK: changed id to named
  for(i=0;i<e.length;i++){
      Prepare(e[i]);
      }
}

function AddCss(){
var l=CreateEl("link");
  l.setAttribute("type","text/css");
  l.setAttribute("rel","stylesheet");
  l.setAttribute("href","bt.css");
  l.setAttribute("media","screen");
  document.getElementsByTagName("head")[0].appendChild(l);
}

function Prepare(el){
var tooltip,t,b,s,l;
  t=el.getAttribute("title");
  //AK: ignore if no title attribute
  if(t==null || t.length==0) return;
  el.removeAttribute("title");
  //AK: set class for element to be tooltipped (except for IMG)
  if (el.nodeName!="IMG") el.className="tooltipper";

  tooltip=CreateEl("span","tooltip");
  s=CreateEl("span","top");
  s.appendChild(document.createTextNode(t));
  tooltip.appendChild(s);
  b=CreateEl("b","bottom");
  //AK: do not include href in tooltip
  //l=el.getAttribute("href");
  //if(l.length>30) l=l.substr(0,27)+"...";
  //b.appendChild(document.createTextNode(l));
  tooltip.appendChild(b);
  setOpacity(tooltip);
  el.tooltip=tooltip;
  el.onmouseover=showTooltip;
  el.onmouseout=hideTooltip;
  el.onmousemove=Locate;
}

function CreateEl(t,c){
var x=document.createElement(t);
  x.className=c;
  x.style.display="block";
  return(x);
}

function setOpacity(el){
  //AK: changed opacity from 0.95 to 0.99
  el.style.filter="alpha(opacity:99)";
  el.style.KHTMLOpacity="0.99";
  el.style.MozOpacity="0.99";
  el.style.opacity="0.99";
}

function showTooltip(e){
  document.getElementById("btc").appendChild(this.tooltip);
  Locate(e);
}

function hideTooltip(e){
  var d=document.getElementById("btc");
  if(d.childNodes.length>0) d.removeChild(d.firstChild);
}

function Locate(e){
var posx=0,posy=0;
  if(e==null) e=window.event;
  if(e.pageX || e.pageY){
      posx=e.pageX; posy=e.pageY;
      }
  else if(e.clientX || e.clientY){
      if(document.documentElement.scrollTop){
          posx=e.clientX+document.documentElement.scrollLeft;
          posy=e.clientY+document.documentElement.scrollTop;
          }
      else{
          posx=e.clientX+document.body.scrollLeft;
          posy=e.clientY+document.body.scrollTop;
          }
      }
  document.getElementById("btc").style.top=(posy+10)+"px";
  document.getElementById("btc").style.left=(posx-20)+"px";
}