The dropdown menu supports input and automatically locates according to the input content

The Drop-down menu supports input and is automatically positioned according to the input content:
Reference: The actor is published in the 10/23/2001 8:58:16 AM article "Lofty's decryption simplified version of the removable dropdown box." In this special thanks to the relevant people.
This article adds a little bit of functionality to the Drop-down box: The input can be positioned in an existing selection box. There is also a disadvantage, you have to change: when the input can not automatically pull off the selection box, how to do?
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 could be displayed properly:" +
"This product requires Microsoft Internet Explorer 5 or later browser only.";
Alert (msg);