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function tooltip(e,callback,on,param) {
  var tt = getE('tooltip'), rect = getE('ttrect'), shadow = getE('ttshdw'),
    offset = {$number:offset}, pos = svgCursorCoords(e),
    x = pos[0] + offset, y = pos[1] + offset, inner, brect, bw, bh,
    sw, sh, de = svgNode(e);
  if(on && !tt) {
    tt = newel('g',{id:'tooltip',visibility:'visible'});
    rect = newel('rect',{id:'ttrect',stroke:'{$string:stroke}',
      'stroke-width':'{$number:stroke_width}px',
      fill:'{$string:back_colour}'{$string:round_part},
      width:'10px',height:'10px'
    });
{$string:shadow_part}
    tt.appendChild(rect);
  }
  if(tt) {
    if(on) {
      if(tt.parentNode && tt.parentNode != de)
        tt.parentNode.removeChild(tt);
      de.appendChild(tt);
    }
    showhide(tt,on);
  }
  inner = callback(e,tt,on,param);
  if(inner && on) {
    brect = inner.getBBox();
    bw = Math.ceil(brect.width + {$number:dpad});
    bh = Math.ceil(brect.height + {$number:dpad});
    setattr(rect, 'width', bw + 'px');
    setattr(rect, 'height', bh + 'px');
    {$string:transform_part}
    if(shadow) {
      setattr(shadow, 'width', (bw + {$number:stroke_width}) + 'px');
      setattr(shadow, 'height', (bh + {$number:stroke_width}) + 'px');
    }
    if(bw + x > de.width.baseVal.value - {$number:edge_space}) {
      x -= bw + offset * 2;
      x = Math.max(x, 0);
    }
    if(bh + y > de.height.baseVal.value - {$number:edge_space}) {
      y -= bh + offset * 2;
      y = Math.max(y, 0);
    }
  }
  on && setattr(tt,'transform','translate('+x+' '+y+')');
  tooltipOn = on ? 1 : 0;
}