VBS for click on a html(css) button

This Is a part of the code running on the webserver:
<td><INPUT TYPE="button" VALUE="ON " onClick="parent.location='/?H3'"></td>

Now I want to write an VBscript to click on the button. eg send "parent.location='/?H3'" to the webserver.
I tried to google but cannot find anything useful. Any help would be appreciated. Thanks in advance.