Filling Textboxes In Webbrowser Document

Hey. I need to fill textbox, which is protected or something..
Textbox's code is like this:

HTML Code:
<INPUT TYPE=hidden NAME=a0f2a0707462ad79826e98a1ce5721ad2 VALUE=951b01a2af33d0779983>

Can i fill text boxes in some kind of other way?
Because using
VB Code:
Wb.Document.All("a0f2a0707462ad79826e98a1ce5721ad2").Value = "lol"

Is not useful, because the textboxes name is different every time..
More of this code:

HTML Code:
<FORM ACTION=http://www.rate.ee/userinfo.php METHOD=post onSubmit="post.disabled=true;">
pealkiri: <INPUT CLASS=in1 TYPE=text NAME=subject SIZE=30 MAXLENGTH=60><BR><BR>
<TEXTAREA CLASS=in1 ROWS=10 COLS=60 NAME=text></TEXTAREA><BR><BR>
<INPUT TYPE=hidden NAME=act VALUE=contact>
<INPUT TYPE=hidden NAME=id VALUE=202005>

<INPUT TYPE=hidden NAME=a0f2a0707462ad79826e98a1ce5721ad2 VALUE=951b01a2af33d0779983>
<INPUT CLASS=in1 onMouseOver="this.classNAME='in2';" onMouseOut="this.classNAME='in1'" TYPE=submit NAME=post VALUE="Saadan!">
</FORM>
<BR></td>
<TD WIDTH=4 CLASS=moduleContentText><IMG SRC=http://pics.rate.ee/pics/empty.gif WIDTH=1 HEIGHT=1></TD>
<td width=1 valign=top class=backFrame><img src=http://pics.rate.ee/pics/empty.gif width=1 height=1></td>
</tr>
</table>