一個關于日歷的問題???請幫忙解決!!

<%@page contentType="text/html"%> 
<%@page pageEncoding="UTF-8"%> 
<script language="javascript"> 
  
  
function dates() 
{      var days=new Date(years,Months,0).getDate(); 
      var dates=new Date(years,Months-1,1).getDay(); 
  
    document.write(" <table border=1 bgcolor=#E2CCEA frame=void rules=none>"); 
    document.write(" <tr>"); 
    document.write(" <td>"); 
    document.write(" <a id=R>"); 
    document.write("f </a>"); 
    document.write(" </td>"); 
    document.write(" <td colspan=5 align=center>"); 
    document.write(years+'年'+Months+'月'+day+'日'); 
    document.write(" </td>"); 
    document.write(" <td  >"); 
    document.write(" <a onclick=javascript:E(this); id=L >"); 
    
    document.write("f </a>"); 
    document.write(" </td>"); 
    document.write(" </tr>"); 
    document.write(" <tr>"); 
    document.write(" <td style=color:#EE79A0;>星期日 <br>sun"); 
    document.write(" <br>"); 
    document.write(" </td>"); 
    document.write(" <td>星期一 <br>Mon"); 
    document.write(" <br>"); 
    document.write(" </td>"); 
    document.write(" <td>星期二 <br>Tue"); 
    document.write(" <br>"); 
    document.write(" </td>"); 
    document.write(" <td>星期三 <br>Wed"); 
    document.write(" <br>"); 
    document.write(" </td>"); 
    document.write(" <td>星期四 <br>Thu"); 
    document.write(" <br>"); 
    document.write(" </td>"); 
    document.write(" <td>星期五 <br>Fri"); 
    document.write(" <br>"); 
    document.write(" </td>"); 
    document.write(" <td style=color:#EE79A0;>星期六 <br>Sat"); 
    document.write(" <br>"); 
    document.write(" </td>"); 
  
    h=1; 
    for(i=0;i <=5;i++) 
    {  document.write(" <tr>"); 
      if(i==0) 
      { for(x=1;x <=dates;x++) 
        { document.write(" <td>"); 
          document.write(); 
          document.write(" </td>"); 
        } 
        for(y=1;y <=7-dates;y++) 
        { 
          document.write(" <td>");            
        if(h==day  ) 
        { document.write(" <font color=#D8617B >"); 
          document.write(h); 
          document.write(" </font>");} 
          else 
          {document.write(h); 
              } 
          document.write(" </td>"); 
          h++; 
        } 
        }    
        else{ 
        for(j=0;j <=6;j++) 
        {  if(h <=days) 
          { document.write(" <td>"); 
          if(h==day) 
            { document.write(" <font color=#D8617B >"); 
              document.write(h); 
              document.write(" </font>");} 
                else 
                {document.write(h); 
              } 
                document.write(" </td>");} 
        h++;} 
        
          } 
  
  document.write(" </tr>"); 
} 
document.write(" </table>"); } 
function R() 
{ 
  Months=Months-1; 
} 
function L() 
{  if(Months <12) 
  { Months=Months+1; 
      
    dates(); 
} 
  
} 
function right() 
{  
  if(Months>1) 
  { 
      dates(); 
    } 
} function E(x) 
{  var idL=document.getElementById("L");; 
  var idR=document.getElementById("R"); 
    if(x==idL) 
  L(); 
  
} 
var year=new Date(); 
  var day=year.getDate(); 
  var years=year.getYear(); 
  var Months=year.getMonth()+1; 
  var years; 
  var Months; 
</script> 
<style> 
    #R{} 
    #L{} 
</style> 
<html> 
    <head> 
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 
        <title>JSP Page </title> 
    </head> 
    <body> <script language="javascript"> dates(); 
document.write("fff"); 
</script> 
    
  
    
    </body> 
</html> 
以上是我正在寫的一個日歷的代碼,(我只寫了一個左邊功能),但只能實現1月到2月,就不能實現月份相加的效果,在網上找答案懷疑是ducument.write 的輸出問題,但還是不知道怎么寫下去!請高人指點!!