<HTML>
<SCRIPT LANGUAGE="JavaScript">
function isreadonly(isReadOnly){
document.forms[0].elements['sss'].readOnly =isReadOnly;
}
</SCRIPT>
<BODY>
<FORM METHOD=POST ACTION="">
<INPUT TYPE="text" NAME="sss">
<INPUT TYPE="button" name="zhidu" value="只读" onclick="isreadonly(true)">
<INPUT TYPE="button" name="edit" value="可编辑" onclick="isreadonly(false)">
</FORM>
</BODY>
</HTML>