javascript复选框得的值怎么往文本框中传呢?
<!DOCTYPE   html   PUBLIC    "-//W3C//DTD   XHTML   1.0   Transitional//EN "    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">  
  <html   xmlns= "http://www.w3.org/1999/xhtml ">  
  <head>  
  <meta   http-equiv= "Content-Type "   content= "text/html;   charset=gb2312 "   />  
  <title> 无标题文档 </title>  
  <style   type= "text/css ">  
  <!-- 
 #Layer1   { 
 	position:absolute; 
 	left:11px; 
 	top:55px; 
 	width:318px; 
 	height:170px; 
 	z-index:1; 
 } 
 #Layer2   { 
 	position:absolute; 
 	left:13px; 
 	top:68px; 
 	width:542px; 
 	height:157px; 
 	z-index:2; 
 	background-color:   #CCCCCC; 
 	visibility:   visible; 
 } 
 -->  
  </style>  
  <script   type= "text/javascript ">  
  <!-- 
 function   MM_reloadPage(init)   {      //reloads   the   window   if   Nav4   resized 
       if   (init==true)   with   (navigator)   {if   ((appName== "Netscape ")&&(parseInt(appVersion)==4))   { 
             document.MM_pgW=innerWidth;   document.MM_pgH=innerHeight;   onresize=MM_reloadPage;   }} 
       else   if   (innerWidth!=document.MM_pgW   ||   innerHeight!=document.MM_pgH)   location.reload(); 
 } 
 MM_reloadPage(true);   
 function   MM_findObj(n,   d)   {   //v4.01 
       var   p,i,x;      if(!d)   d=document;   if((p=n.indexOf( "? "))> 0&&parent.frames.length)   { 
             d=parent.frames[n.substring(p+1)].document;   n=n.substring(0,p);} 
       if(!(x=d[n])&&d.all)   x=d.all[n];   for   (i=0;!x&&i <d.forms.length;i++)   x=d.forms[i][n]; 
       for(i=0;!x&&d.layers&&i <d.layers.length;i++)   x=MM_findObj(n,d.layers[i].document); 
       if(!x   &&   d.getElementById)   x=d.getElementById(n);   return   x; 
 }   
 function   MM_showHideLayers()   {   //v6.0 
       var   i,p,v,obj,args=MM_showHideLayers.arguments; 
       for   (i=0;   i <(args.length-2);   i+=3)   if   ((obj=MM_findObj(args[i]))!=null)   {   v=args[i+2]; 
             if   (obj.style)   {   obj=obj.style;   v=(v== 'show ')? 'visible ':(v== 'hide ')? 'hidden ':v;   } 
             obj.visibility=v;   } 
 } 
 //-->  
  </script>    
  </head>  
  <script         language= "vbs ">           
       sub   zhufang()          
       if         form1.others1.checked      then       
       other1s.style.display= " " 
       else 
       if   form1.bbb.value= " "   then 
       form1.bbb.value= "请填写 " 
       end   if    
       other1s.style.display= "none "      
       end   if          
       end   sub                        
        <