让一个text从readonly状态恢复的问题,100分在线等
<%@   page   language= "java "   import= "java.util.* "   pageEncoding= "gb2312 "   %>  
  <html>  
  <head>  
  </head>  
  <script   language= "javascript ">  
 function   changetype() 
 {  	 
 	if(document.forms[0].type[1].checked) 
 	{ 
 		document.forms[0].belongto.enabled= "true "; 
 		document.forms[0].projectname.readOnly= "true "; 
 	} 
 	if(document.forms[0].type[0].checked) 
 	{ 
 		document.forms[0].belongto.disabled= "true "; 
 		document.forms[0].projectname.readOnly= "false ";	 
 	} 
 }   
 function   init() 
 {	 
 		if(document.forms[0].type[1].checked) 
 		{     
 		document.forms[0].belongto.enabled= "true "; 
 		document.forms[0].projectname.readOnly= "true ";	 
 		} 
 } 
  </script>  
  <body   bgcolor= "#66FF99 "   onload= "init() ">  
  <h1> 文件上传 </h1>  
  <form   name= "uploadform "   method= "POST "   action= "/SoftwareReuseLibrary/FileUpload "   ENCTYPE= "multipart/form-data ">  
                          <table   border= "1 "      cellpadding= "4 "   width= "800 "   cellspacing= "2 "   bordercolor= "#9BD7FF "   align= "center ">  
 		 <tr>  
 		 <td>  
 		 <input   type   = "radio "   name= "type "      value= "new "   onclick= "changetype() "> 新项目上传 </input>  
 		 <input   type   = "radio "   name= "type "      value= "update "   checked   onclick= "changetype() "> 更新已有项目 </input>  
    		 </td>  
 		 </tr>  
 		 <tr>  
 		 <td> 新项目名称: <input   type= "text "   name= "projectname "/>  </td>  
 		 </tr>  
 		 <tr>  
 		 <td>  
 		请选择上传文件所属的项目: 
 		 <select   name= "belongto ">  
 		 <option   value= "null "   selected= "selected "> ---------- </option>  
 		 <option   value= "1 "> 111111 </option>  
 		 </select>  
 		 </td>  
 		 </tr>   		 
                          <tr>  <td   colspan= "2 ">  
                                                                      请选择你需要上传的文件: <input   name= "x "   size= "40 "   type= "file "/>  
                          </td>  
 		 </tr>   		 
 		 <tr>  
 		 <td>  
 		文件功能描述: <br>  
 		 <textarea   name= "fd "   cols= "50 "   rows= "20 ">  </textarea>  
 		 </td>  </tr>   		 
 		 <tr>  <td>  
 		作者: <input   type= "text "   name= "author "/>  </td>  </tr>  
                          <tr>  <td   align= "center ">  <input   name= "upload "   type= "submit "   value= "开始上传