01.<html>
02.<head>
03.<title></title>
04.</head>
05.<body>
06.<script language="javascript">
07.function fnccheck(){
08. var t1;
09. var t2;
10. var sum;
11. if(document.form1.chk1.checked == true){
12. t1=parseFloat(document.form1.text1.value);
13.
14. }else{
15. t1=null;
16.
17. }
18. if(document.form1.chk2.checked == true){
19. t2=parseFloat(document.form1.text2.value);
20.
21. }else{
22. t2=null;
23.
24. }
25.
26. sum=t1+t2;
27. document.form1.total.value=sum;
28.
29.}
30.</script>
31.<form action="page.cgi" method="post" name="form1">
32.<input type="text" name="text1" id="text1" value="2"/>Checkbox 1
33.<input name="chk1" type="checkbox" id="chk1" value="Y" OnClick="JavaScript:return fnccheck();">
34.<br>
35.<input type="text" name="text2" id="text2" value="4"/>
36.Checkbox 2
37.<input name="chk2" type="checkbox" id="chk2" value="Y" OnClick="JavaScript:return fnccheck();">
38.<br>
39.<input type="text" name="total" id="total"/>
40.</form>
41.</body>
42.</html>
