체크박스 전체선택 / 전체해제

http://oxtag.com/html/ex/ex/ex4.html

1. <SCRIPT LANGUAGE="JavaScript">
2. <!--
3. function allcheck(formname,boxname,bool) {
5.     form = eval(formname) ;
6.     flen = form.elements.length ;
8.     for( i=0 ; i<flen ; i++ ) {
9.      if(form.elements[i].name == boxname ) {
10.              form.elements[i].checked = bool ;
11.          }
12.         }
13. }
14. //-->
15. </SCRIPT>
17. <center>
19. <FORM name = 'ff' METHOD=get ACTION="form.asp" target="_blank">
21. <INPUT TYPE="checkbox" NAME="arr" value='a1'>a1<br>
22. <INPUT TYPE="checkbox" NAME="arr" value='a2'>a2<BR>
23. <INPUT TYPE="checkbox" NAME="arr" value='a3'>a3<BR>
24. <INPUT TYPE="checkbox" NAME="arr" value='a4'>a4<BR>
25. <INPUT TYPE="checkbox" NAME="arr" value='a5'>a5<p>
28. </FORM>
30. <a href='javascript:allcheck("ff","arr",true)'>모두체크</a> |
31. <a href='javascript:allcheck("ff","arr",false)'>모두해제</a>