<script type="text/javascript" language="JavaScript">
obj=new Object;obj.clockfile="0011-orange.swf";obj.TimeZone="<script src="http://www.clocklink.com/embed.js"><\/script><script type="text/javascript" language="JavaScript">obj=new Object;obj.clockfile="0011-orange.swf";obj.TimeZone="PST";obj.width=150;obj.height=150;obj.wmode="transparent";showClock(obj);<\/script>";obj.width=180;obj.height=180;obj.wmode="transparent";showClock(obj);
 

</script><script type="text/javascript" language="JavaScript" src=
"http://www.informatik.uni-leipzig.de/~duc/amlich/JavaScript/amlich-hnd.js">
</script><script language="JavaScript" type="text/javascript">
<!--
setOutputSize("small");
document.writeln(printSelectedMonth());
-->
</script><table>
<tr>
<td align="center">
<form name="SelectMonth" action="#amlich">Tháng <select name=
"month">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
 

<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
<option value="10">10</option>
<option value="11">11</option>
<option value="12">12</option>
</select> <input type="button" value="Xem" onclick=
"javascript:viewMonth(parseInt(month.value), parseInt(year.value));">
<br>
 

Năm <input name="year" size="4" value="2005"> <input type="button"
value="Xem" onclick=
"javascript:viewYear(parseInt(year.value));"></form>
</td>
</tr>
</table>
<script type="text/javascript">
<!--
getSelectedMonth();
document.SelectMonth.month.value = currentMonth;
document.SelectMonth.year.value = currentYear;
function viewMonth(mm, yy) {
window.location = window.location.pathname + '?yy='+yy+'&mm='+mm+'#amlich';
}
function viewYear(yy) {
var loc = 'js/amlich-namnay.html?yy='+yy;
var win2702 = window.open(loc, "win2702", "menubar=yes,scrollbars=yes,resizable=yes");
} 

Tạo khối chức năng rồi dán đoạn code trên vào.