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i have some code but the code is missing some features.
1. if we selected box, and than the calculation 2. if we select value of yes on repeated course. how we calculate new gpa and cgpa ?

Script Code

<script type = "text/javascript">

//function to set the focus on GPA form 
function setFocus() { 
document.GPA.focus(); 
return; 
}


//functio to round 2 decimal points 
function round(n){return(.01* Math.round(100*n));}



//function to calculate gpa 
function calculate(fr) 
{ 





//checking if all credit hours equal to zero 
if (fr.CH1.selectedIndex=="0") 
{alert ("Please specify your credit hours") } 



else 

//calculating 
var resultgpa; 
fr.resultgpa.value=round((eval(fr.CH1.selectedIndex)*parseFloat(fr.grade1.value))
/(eval(fr.CH1.selectedIndex)))

var resultcgpa; 
fr.resultcgpa.value 
=round((eval(fr.CH1.selectedIndex)*parseFloat(fr.grade1.value)+ 
parseFloat(fr.cgpa.value)*parseFloat(fr.TCH.value)) 
/(eval(fr.CH1.selectedIndex)+ 
parseFloat(fr.TCH.value)))



}


</script>

HTML Code:

<form action="none" name="GPA">
<table  width="700" border="3"  align="center" valign="top" > 
<!--creating form to send data to function--> 


    <tr><td><p align="center"style="font-size:16pt"><b>Select</b></p></td>
    <td><p align="center"style="font-size:16pt"><b>Courses</b></p></td>
    <td><p align="center"style="font-size:16pt"><b>Credit</b></p></td>
    <td><p align="center"style="font-size:16pt"><b>Expected/Grade</b></p></td>
    <td><p align="center"style="font-size:16pt"><b>Repeted Course</b></p></td>
    <td><p align="center"style="font-size:16pt"><b>Previous Grade</b></p></td></tr>

<tr> 
<td>1. <input type="checkbox" text name="sn1"value="smoker"/></td>
<td><select name="c1">
<option value="unknown">Select</option>
<option>CPE 101</option>
<option>ENG 101</option>
<option>ECO 101</option>
<option>MAT 101</option>
<option>PHY 101</option>
<option>HTR 101</option>
<option>TUR 101</option>
<option>CPE 112</option>
<option>ENG 102</option>
<option>MAT 102</option>
<option>PHY 102</option>
<option>CHM 110</option>
<option>CPE 221</option>
<option>CLE 201</option>
<option>CLE 201</option>
<option>MAT 201</option>
<option>MAT 205</option>
<option>XXX XXX</option>
<option>CPE 222</option>
<option>ILE 224</option>
<option>ILE 212</option>
<option>ILE 232</option>
<option>MAT 204</option>
<option>CPE 313</option>
<option>CPE 321</option>
<option>CPE 331</option>
<option>CPE 351</option>
<option>CPE 341</option>
<option>CPE 326</option>
<option>CPE 332</option>
<option>CPE 342</option>
<option>CPE 324</option>
<option>CPE 322</option>
<option>CPE 411</option>
<option>CPE 413</option>
<option>CPE 415</option>
<option>CPE 400</option>
<option>CPE 414</option>
<option>CPE 415</option>
</select></td>
<td align = "center"> 
<select name= "CH1"> 
<option value = "0" SELECTED>Select 
<option value = "1">1 
<option value = "2">2 
<option value = "3">3 
<option value = "4">4

</select></td>

<td align = "center" width = "70"> 
<select name= "grade1"> 
<option value = "5" SELECTED>Select 
<option value = "4">A 
<option value = "3.70">A- 
<option value = "3.30">B+ 
<option value = "3">B 
<option value = "2.70">B- 
<option value = "2.30">C+ 
<option value = "2">C 
<option value = "1.70">C- 
<option value = "1.30">D+ 
<option value = "1">D
<option value = "0.7">D-  
<option value = "0">F
</select></td>

    <td> <center>
         <input type="radio" name="1">Yes
         <input type="radio" name="1">No
    </center></td>

<td align = "center"> 
<select name= "g1"> 
<option value = "5" SELECTED>Select 
<option value = "4">A 
<option value = "3.70">A- 
<option value = "3.30">B+ 
<option value = "3">B 
<option value = "2.70">B- 
<option value = "2.30">C+ 
<option value = "2">C 
<option value = "1.70">C- 
<option value = "1.30">D+ 
<option value = "1">D
<option value = "0.7">D-  
<option value = "0">F

</select></td>
</tr>
</table>
<table width="400" border="3" align="center" valign="top"> 


<tr> 
<td><p align="center"style="font-size:16pt"><b> Your Current CGPA:</b></p> </td><td align="right"><input type = text name="cgpa"></td></tr>

<tr><td><p align="center"style="font-size:16pt"><b>Your Credit Hours Taken Is:</b></p> </td><td align="right"><input type = text name="TCH"></td></tr>

</table>

<table width="400" border="3" align="center" valign="top"> 





<!--sending information to calculate() function-->

<!--getting back result from function--> 
<tr><td><p align="center"style="font-size:16pt"><b>Your GPA Will Be:</b></p></td> 
<td align="right"><input type = text name="resultgpa"></td></tr>

<!--getting back result from function--> 
<tr><td><p align="center"style="font-size:16pt"><b>Your CPGA Will Be:</b></p></td> 
<td align="right"><input type = text name="resultcgpa"></td></tr>

<tr><td><input type = "button" value = "Calculate!" onclick = "calculate(this.form)" name = "bottun"></td>

<!--reset button--> 
<td align="right"><input type="reset" name="reset" value="Clear">

</td></tr> 
</table>
</form>
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