提交后返回值是空，怎么才能得到我选择的值呢？

[DaimonJ]

<SCRIPT event=onclick for=Ok language=JavaScript>
window.returnValue = picsite.value
window.close();
</SCRIPT>
<TABLE border=0 cellPadding=0 cellSpacing=10>
<TBODY>
<TR><TD align=middle colSpan=3>图片位置</TD></TR>
<TR>
<TD><INPUT TYPE="radio" id="picsite" value=1></TD>
<TD><INPUT TYPE="radio" id="picsite" value=2></TD>
<TD><INPUT TYPE="radio" id="picsite" value=3></TD>
</TR>
<TR>
<TD align=middle colSpan=3>
<BUTTON id="Ok" type="submit">确定</BUTTON>
<BUTTON onclick="window.close();">取消</BUTTON>
</TD>
</TR>

[fason]

<SCRIPT event=onclick for=Ok language=JavaScript>
for(i=0;i<picsite.length;i++)
if(picsite[i].checked){
window.returnValue = picsite[i].value
window.close();
}
</SCRIPT>
<TABLE border=0 cellPadding=0 cellSpacing=10>
<TBODY>
<TR><TD align=middle colSpan=3>图片位置</TD></TR>
<TR>
<TD><INPUT TYPE="radio" name="picsite" value=1></TD>
<TD><INPUT TYPE="radio" name="picsite" value=2></TD>
<TD><INPUT TYPE="radio" name="picsite" value=3></TD>
</TR>
<TR>
<TD align=middle colSpan=3>
<BUTTON id="Ok" type="submit">确定</BUTTON>
<BUTTON onclick="window.close();">取消</BUTTON>
</TD>
</TR>