象OFFICE ONLINE那样的文字说明,一个小加号,点击展开,后文下挪,怎样实现?
象OFFICE ONLINE那样的文字说明,一个小加号,点击展开,后文下挪,怎样实现? 
 俺挺菜的,要是用及控件请能帮说明哪里有那控件的使用说明,要是需编代码帮说一下那代码怎么用。   
 多谢了。
------解决方案-------------------- <html>  
  <head>  
  <title> 找我啊.. </title>  
  <SCRIPT language=javascript1.2>  
  <!-- 
 function showsubmenu(sid) 
 { 
 whichEl = eval( "submenu " + sid); 
 if (whichEl.style.display ==  "none ") 
 { 
 eval( "submenu " + sid +  ".style.display=\ "\ "; "); 
 } 
 else 
 { 
 eval( "submenu " + sid +  ".style.display=\ "none\ "; "); 
 } 
 }   
 function GP_popupConfirmMsg(msg) { //v1.0 
   document.MM_returnValue = confirm(msg); 
 } 
 //-->  
  </SCRIPT>  
  </head>  
  <BODY leftmargin= "0 " topmargin= "0 " marginheight= "0 " marginwidth= "0 ">  
  <table width=158 align=center cellpadding=0 cellspacing=1 bgcolor= "#006699 ">  
        <tr>  
          <td height=25 align= "center " bgcolor= "#FFFFFF " class=menu_title id=menuTitle1 style= "cursor:hand; " onclick= "showsubmenu(1) " onmouseover=this.className= 'menu_title2 '; onmouseout=this.className= 'menu_title ';>   
            <span> 点我啊 </span>  </td>  
    </tr>  
    <tr>  
          <td bgcolor= "#FFFFFF " id= 'submenu1 ' style= "display:none ">   
            <div class=sec_menu style= "width:158 ">  真被你找着了.^^ </div>  
 	 </td>  
    </tr>  
  </table>  
  </body>  
  </html>    
 把 "点我啊 "换成你需要的图片即可