}
  function dblclickOnNode(e){
    var p = tx.rowinfo[parseInt(this.id.match(/\d+$/)[0], 10)-tx.iTopRow];
    window.location.href = tx.baseUrl+"/info/"+p.h
    e.stopPropagation()
  }
  function findTxIndex(e){
    if( !tx.rowinfo ) return -1;
    /* Look at all the graph elements.  If any graph elements that is near
    ** the click-point "e" and has a "data-ix" attribute, then return
    ** the value of that attribute.  Otherwise return -1 */
    var x = e.clientX + window.pageXOffset - absoluteX(canvasDiv);
    var y = e.clientY + window.pageYOffset - absoluteY(canvasDiv);
    var aNode = canvasDiv.childNodes
    var nNode = aNode.length;