if( x<n.offsetLeft-5 ) continue;
      if( x>n.offsetLeft+n.offsetWidth+5 ) continue;
      if( y<n.offsetTop-5 ) continue;
      if( y>n.offsetTop+n.offsetHeight ) continue;
      return n.getAttribute("data-ix")
    }
    return -1
  }
  /* Compute the hyperlink for the branch graph for tx.rowinfo[ix] */
  function branchHyperlink(ix){
    var br = tx.rowinfo[ix].br
    var dest = tx.baseUrl + "/timeline?r=" + encodeURIComponent(br)
    dest += tx.fileDiff ? "&m&cf=" : "&m&c="
    dest += encodeURIComponent(tx.rowinfo[ix].h)
    return dest
  }
  function clickOnGraph(e){
    var ix = findTxIndex(e);
    if( ix<0 ){
      tooltipObj.style.display = "none"
    }else{  
      var br = tx.rowinfo[ix].br
      var dest = tx.baseUrl + "/timeline?r=" + encodeURIComponent(br)
      var dest = branchHyperlink(ix)
      dest += "&c=" + encodeURIComponent(tx.rowinfo[ix].h)
      var hbr = br.replace(/&/g, "&amp;")
         .replace(/</g, "&lt;")
         .replace(/>/g, "&gt;")
         .replace(/"/g, "&quot;")
         .replace(/'/g, "&#039;");
      tooltipObj.innerHTML = "<a href=\""+dest+"\">"+hbr+"</a>"
      tooltipObj.style.display = "inline"
      tooltipObj.style.position = "absolute"
      var x = e.x + 4 + window.pageXOffset
      tooltipObj.style.left = x+"px"
      var y = e.y + window.pageYOffset - tooltipObj.clientHeight - 4
      tooltipObj.style.top = y+"px"
      tooltipObj.style.visibility = "visible"
    }
  }
  function dblclickOnGraph(e){
    if( tx.fileDiff ) return
    var ix = findTxIndex(e);
    var br = tx.rowinfo[ix].br
    var dest = "/timeline?r=" + encodeURIComponent(br)
    var dest = branchHyperlink(ix)
    dest += "&c=" + encodeURIComponent(tx.rowinfo[ix].h)
    tooltipObj.style.display = "none"
    window.location.href = tx.baseUrl + dest
    window.location.href = dest
  }
  function changeDisplay(selector,value){
    var x = document.getElementsByClassName(selector);
    var n = x.length;
    for(var i=0; i<n; i++) {x[i].style.display = value;}
  }
  function changeDisplayById(id,value){