01.<html>
02.<head>
03.<title>ThaiCreate.Com Tutorial</title>
04.</head>
05.<body>
06.<script language="javascript">
07.function fncSubmit()
08.{
09. for(i=1;i<=document.form1.hdnLine.value;i++)
10. {
11. if(eval("document.form1.chk"+i+".checked")==false)
12. {
13. alert("Please Click Checkbox "+i+" Thank.");
14. return false;
15. }
16. }
17. document.form1.submit();
18.}
19.</script>
20.<form action="page.cgi" method="post" name="form1" onSubmit="JavaScript:return fncSubmit();">
21.Checkbox 1 <input name="chk[]" type="checkbox" id="chk1" value="Y"><br>
22.Checkbox 2 <input name="chk[]" type="checkbox" id="chk2" value="Y"><br>
23.Checkbox 3 <input name="chk[]" type="checkbox" id="chk3" value="Y"><br>
24.Checkbox 4 <input name="chk[]" type="checkbox" id="chk4" value="Y"><br>
25.Checkbox 5 <input name="chk[]" type="checkbox" id="chk5" value="Y"><br>
26.<input type="hidden" name="hdnLine" value="5">
27.<input name="btnSubmit" type="submit" value="Submit" >
28.</form>
29.</body>
30.</html>
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