function enableTooltips(id)
{
  var links,i,h;
  
  if(!document.getElementById || !document.getElementsByTagName) return;
  
  AddCss();
  
  h=document.createElement("span");
  h.id="btc";
  h.setAttribute("id","btc");
  h.style.position="absolute";
  h.style.zIndex = 1000;

  document.getElementsByTagName("body")[0].appendChild(h);
  
  if(id==null) links=document.getElementsByTagName("a");
  
  else links=document.getElementById(id).getElementsByTagName("a");
  
  for(i=0;i<links.length;i++)
  {
    if(links[i].className == 'tip')
    {
      Prepare(links[i]);
    }
  }
}


function Prepare(el)
{
  var tooltip,t,b,s,l;
  t=el.getAttribute("title");
  
  if(t==null || t.length==0) t="";
  el.removeAttribute("title");
  tooltip=CreateEl("span","tooltip");
  s=CreateEl("span","top");
  s.appendChild(document.createTextNode(" "));
  tooltip.appendChild(s);
  
  b=CreateEl("b","bottom");
  l=el.getAttribute("href");
  if(l.length>28) l=l.substr(0,25)+"...";
  b.appendChild(document.createTextNode(t));
  tooltip.appendChild(b);
  
  setOpacity(tooltip);
  el.tooltip=tooltip;
  el.onmouseover=showTooltip;
  el.onmouseout=hideTooltip;
  el.onmousemove=Locate;
}


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 setOpacity(el)
{
  el.style.filter="alpha(opacity:95)";
  el.style.KHTMLOpacity="0.95";
  el.style.MozOpacity="0.95";
  el.style.opacity="0.95";
}


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


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


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-40)+"px";
}