hi Ken. 

thank you very much,it works. the code can get the full path.

but when  user click button,blow this control will show a [  <input name="Uploader1$File" type="file"> ]  html tag. it's not display=none... it's not very well.

sp:

NoFlash,NoSilverlight,NoHtml5,   both of these code must be used in Onload function...delete any line code is not  work.