JS定位光标在textarea中的位置

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head>  <title> New Document </title>  <meta name="Generator" content="EditPlus">  <meta name="Author" content="">  <meta name="Keywords" content="">  <meta name="Description" content=""><script type="text/javascript">  function insertText(obj,str) {    if (typeof obj.selectionStart === 'number' && typeof obj.selectionEnd === 'number') {        var startPos = obj.selectionStart,            endPos = obj.selectionEnd,            cursorPos = startPos,            tmpStr = obj.value;        obj.value = tmpStr.substring(0, startPos) + str + tmpStr.substring(endPos, tmpStr.length);        cursorPos += str.length;        obj.selectionStart = obj.selectionEnd = cursorPos;    } else {        obj.value += str;    }} 
function inser(o){ var t = document.getElementById("f"); insertText(f,o);}</script> </head>
 <body> <input type="button" value="增加" onclick="inser('增加')"> <input type="button" value="修改" onclick="inser('修改')"> <input type="button" value="删除" onclick="inser('删除')"> <br/> <hr/>  <textarea id="f">q  </textarea> </body></html>