下拉菜单

用javascript动态生成select下拉菜单，然后用jquery获取下拉菜单的值

<script type="text/javascript" src="<%=path %>/web/js/jquery/lib/jquery-1.4.js"></script>    
<script type="text/javascript">
    function create(){
        var value = $("#myselect").val();
        alert(value);
    };
    document.write("<form name='myform'><TABLE height='20%' cellSpacing=0 cellPadding=0 width='100%' bgColor=#b0e0e6 border=0>");
    document.write("<tr><td>&nbsp;&nbsp;&nbsp账期：");
    document.write("<select id='myselect'>");
        var year =2000;
        var month =1;
        for(var i=0;i<2400;i++){
            if(month>12){
                year++;
                month=1;
            }
            var datestr = year+"年"+month+"月";
            if(year==2013 && month==5 ){
                document.write("<option selected='selected'>"+datestr+"</option>");//默认当前选中值
                }else{
                    document.write("<option >"+datestr+"</option>");
                }
            month++;
        }
    document.write("</select></td>");
    document.write("<td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;");
    document.write("<span style='font-size:14px;'><a href='javascript:void(0);' onclick='create()' >生成账期</a></span></td>");
    document.write("<td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;");
    document.write("<span style='font-size:14px;'><a href='www.baidu.com'>删除账期</a></span></td>");
    document.write("</tr></TABLE></form>");
</script>