javascript怎样实现include功能？

Question

<SCRIPT src="header.htm"></SCRIPT>
改成：
<script src="header.js"></script>

Answer 1

<SCRIPT src="header.js"></SCRIPT>header.js
document.write(' 内容 ‘）

Answer 2

谢谢回复
我晕~
我怎么还是不可以啊？网页上包含错误。
行：2
字符：17
错误：未结束的字符串常量
代码：0
header.js 内容：document.write('
      <TABLE cellSpacing=0 cellPadding=0 width="100%" bgColor=#ffffff border=0>
  <TBODY>
        <TR>
          <TD width=368 rowSpan=2><IMG height=50 src="./images/logo2.gif" 
            width=380></TD>
          <TD width=409 height=18>&nbsp;</TD></TR>
        <TR>
          <TD vAlign=bottom width=409 height=31>
            <marquee class=9hoa scrollamount=3 width=300 height=8 border="0"><DIV align=center>?????<STRONG>
<FONT color=#cc0000>客户的满意就是我们的成功！</FONT></STRONG></DIV></marquee></TD></TR></TBODY></TABLE> 
      <TABLE cellSpacing=0 cellPadding=0 width="100%" border=0>
        <TBODY>
        <TR>
          <TD width=491 background=./images/bg.gif height=20><A 
            href="./index.html"><IMG height=20 
            src="./images/n1.gif" width=93 border=0 name=Image15></A><A 
            href="./news/news.htm"><IMG height=20 
            src="./images/n2.gif" width=93 border=0 name=Image12></A>
            <div id="Layer2" style="position:absolute; width:0; height:0; z-index:4">
              <div id="menu1" style="position:absolute; left:-5px; top:20px; width:99px; height:67px; z-index:1; background-color: #C61008; layer-background-color: #C61008; border: 1px none #000000; visibility: hidden;" onMouseOver="MM_showHideLayers('menu1','','show')" onMouseOut="MM_showHideLayers('menu1','','hide')">
                <table width="100%"  border="0">
                  <tr>
                    <td><div align="center"><span class="style2">路由器</span></div></td>
                  </tr>
                  <tr>
                    <td><div align="center"><span class="style2">交换机</span></div></td>
                  </tr>
                  <tr>
                    <td><div align="center"><span class="style2">光纤</span></div></td>
                  </tr>
                  <tr>
                    <td><div align="center"><span class="style2">光设备</span></div></td>
                  </tr>
                </table>
              </div>
            </div>            <A 
            href="./infor/infor.htm" 
            onmouseover="MM_showHideLayers('menu1','','show')" 
            onmouseout=MM_showHideLayers('menu1','','hide')><IMG 
            src="./images/n3.gif" name=Image13 width=93 height=20 border=0></A><A 
            href="./service/service.htm"><IMG 
            height=20 src="./images/n4.gif" width=93 border=0 
            name=Image14></A>
            <div id="Layer1" style="position:absolute; width:0; height:0; z-index:3">
              <div id="menu2" style="position:absolute; left:-5px; top:20px; width:98px; height:67px; z-index:2; visibility: hidden;" onMouseOver="MM_showHideLayers('menu2','','show')" onMouseOut="MM_showHideLayers('menu2','','hide')">
                <table width="100%"  border="0" bgcolor="#C61008">
                  <tr>
                    <td><div align="center"><span class="style2">公司简介</span></div></td>
                  </tr>
                  <tr>
                    <td><div align="center" class="style2">公司架构</div></td>
                  </tr>
                  <tr>
                    <td><div align="center" class="style2">公司资质</div></td>
                  </tr>
                </table>
              </div>
            </div>            <A 
            href="./aboutus/aboutus.htm" onmouseover="MM_showHideLayers('menu2','','show')" onmouseout="MM_showHideLayers('menu2','','hide')"><IMG src="./images/nn1.gif" 
            name=Image16 width=93 
            height=20 border=0></A></TD>
          <TD width=305 background=./images/bg.gif height=20>
            <DIV align=right><IMG height=18 src="./images/map.gif" 
            width=120 useMap=#Map border=0></DIV></TD></TR></TBODY></TABLE> 
')

Answer 3

改成：
document.write('<TABLE cellSpacing=0 cellPadding=0 width="100%" bgColor=#ffffff border=0><TBODY><TR><TD width=368 rowSpan=2><IMG height=50 src="./images/logo2.gif" width=380></TD><TD width=409 height=18>&nbsp;</TD></TR><TR><TD vAlign=bottom width=409 height=31><marquee class=9hoa scrollamount=3 width=300 height=8 border="0"><DIV align=center>?????<STRONG><FONT color=#cc0000>客户的满意就是我们的成功！</FONT></STRONG></DIV></marquee></TD></TR></TBODY></TABLE><TABLE cellSpacing=0 cellPadding=0 width="100%" .......
没有回车的.