獲取iframe裏的值

<script type="text/javascript" language="javascript">

    function CCCC(){

       var File_NAME="";

       var count=0;

       if(document.frames("myFrame").document.all.length){

           for(var i=0;i<document.all.length;i++){

              if(document.frames("myFrame").document.all(i).type == 'checkbox' && document.frames("myFrame").document.all(i).checked== true) {

                     File_NAME=document.frames("myFrame").document.all(i).value;

                     alert(File_NAME);

                     count++;

              }

           }

       }

       if(count==1){

              var url="<%=path%>/AttSSSS?File_NAME="+File_NAME;

              var returnValue=showModalDialog(url,"AttSSSS","dialogWidth:700px;dialogHeight:500px;dialogLeft:400px;dialogTop:200px;center:yes;help:yes;resizable:yes;status:yes");

               if(returnValue){

                  window.location.href= window.location.href;

               }

       }

       else if(count<1){

            alert('您尚未選擇信息，請在須要選擇的條目點擊鼠標!');

       }

        else{

            alert('每次只能選擇一條信息!');

       }

    }

</script>