怎样获取日历的年月的值

<DIV id=detail  style="Z-INDEX: 3; FILTER: shadow(color=#333333,direction=135); WIDTH: 140px; POSITION: absolute; HEIGHT: 120px"></DIV>
<br>
  <CENTER>
    <TABLE border="0" class="TableData">
      <FORM name="CLD">
        <tr>
<TD align=left>
    <DIV style="Z-INDEX: -1; POSITION: absolute; TOP:30px">
         <FONT id=YMBG style="FONT-SIZE: 50pt; COLOR: #f0f0f0; FONT-FAMILY: 'Arial Black'"></FONT>
       </DIV>
       <TABLE border=0>
         <TR>
           <TD bgColor=#000080 colSpan=7>
            <div>
             <FONT style="FONT-SIZE: 9pt;cursor:hand" color=#ffffff size=1>
               公元 <BUTTON style="FONT-SIZE: 9pt;cursor:hand" onclick="pushBtm('YU')">
             <B><</B></BUTTON>
<SELECT style="FONT-SIZE: 9pt" onchange="changeCld()"  name="SY" >
<script language="JavaScript">
            <!--
             for(i=1900;i<2101;i++) document.write('<option>'+i)
            //-->
    </script>
    </SELECT>
       <BUTTON style="FONT-SIZE: 9pt;cursor:hand" onclick="pushBtm('YD')">
      <B>></B></BUTTON> 年 <BUTTON style="FONT-SIZE: 9pt;cursor:hand" onclick="pushBtm('MU')"><B><</B></BUTTON>
     <SELECT style="FONT-SIZE: 9pt" onchange=changeCld() name="SM" >
            <SCRIPT language=JavaScript>
            <!--
            for(i=1;i<13;i++) document.write('<option>'+i)
            //-->
            </SCRIPT>
      </SELECT>
            <BUTTON style="FONT-SIZE: 9pt;cursor:hand" onclick="pushBtm('MD')">
            <B>></B></BUTTON> 月</FONT>
            <BUTTON style="FONT-SIZE: 9pt;cursor:hand" onclick="pushBtm('')">本月</BUTTON>
            <FONT id=GZ face=标楷体 color=#ffffff size=-1></FONT></div>
</TD>
请求大家帮助看看。。。。。