function getLeftPostion( theObj )
{
  var pos = 0;
  while ( theObj != null )
  {
    pos += theObj.offsetLeft;
    //get the Object which contain theObj.
    theObj = theObj.offsetParent;
  }
  return pos;
}
function getTopPostion( theObj )
{
  var pos = 0;
  while ( theObj != null )
  {
    pos += theObj.offsetTop;
    //get the Object which contain theObj.
    theObj = theObj.offsetParent;
  }
  return pos;
}
function checkVersion()
{
  var isBadVersion=true;
  var curVer=navigator.appVersion;
  var pos=parseInt(curVer.indexOf("MSIE"));
  if (pos>=1)
  {
    var intVer=parseInt(curVer.charAt(pos+5));
    if (intVer>=5)
    { isBadVersion=false;}
  }
  if (isBadVersion)
  {
    var msg="This page may not be displayed properly:\n"+
            " This product requires Microsoft Internet Explorer 5 or later browser only.";
    alert(msg);
  }
}
//check the browser version
checkVersion();
// the array of comboBoies
theArray = new Array();
function combobox(objId, objHandler)
{
  this.comObj = document.all[objId];
  //this.comObj.selectedIndex = -1;  我觉得可以去掉这一句
  this.getValue = getValue;
  this.doResize = doResize;
  this.doChange = doChange;
  this.loseFocus = loseFocus;
  this.doSelectIdx = doSelectIdx;
  this.doSelectValue = doSelectValue;
  this.focus = focus;
  var strMsg="";
//------------------------------------------------------------------------------------------------------
// create the text object
//------------------------------------------------------------------------------------------------------
  var txtObjIdName = objId + "_text";
  if (document.all[txtObjIdName] != null)
  {
    strMsg="The following id: '" + txtObjIdName +"' is used internally by the Combo Box!\r\n"+
           "Use of this id in your page may cause malfunction. Please use another id for your controls.";
    alert(strMsg);
  }
  var txtInner = "<INPUT type='text' id=" + txtObjIdName + " name=" + txtObjIdName +
                 " onblur='" + objHandler + ".loseFocus()' " +
                 " style='display: none; position: absolute' value='' >";
  this.comObj.insertAdjacentHTML("afterEnd", txtInner);
  this.txtObj = document.all[txtObjIdName];
//------------------------------------------------------------------------------------------------------
// end