getAbsolutePos = function(el) {
 var r = { x: el.offsetLeft, y: el.offsetTop };
 if (el.offsetParent) {
  var tmp = getAbsolutePos(el.offsetParent);
  r.x += tmp.x;
  r.y += tmp.y;
 }
 return r;
};
var el=document.getElementById("flg");
var objs=getAbsolutePos(el);
 var y=objs.y+document.form1.flg.offsetHeight;
 var x=objs.x;
取到flg的位置

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