ohm calculator

form.html

<form name="f1">
<table cellpadding="5" cellspacing="0" border="0" bgcolor="#ffedcf">
<tr>
<td colspan="4" align="center">Enter two known values and press <b>Solve</b> to 
calculate unknowns.</td>
</tr><tr>
<td align="center" width="90"><input type="Text" name="volts" size=5><br>Volts<br>

(Volts)</td>
<td align="center" width="90"><input type="Text" name="ohms" size=5 ><br>
Resistance<br>(Ohms)</td>
<td align="center" width="90"><input type="Text" name="amps" size=5 ><br>Current<br>
(Amps)</td>
<td align="center" width="90"><input type="Text" name="watts" size=5 ><br>Power<br>
(Watts)</td>
</tr><tr>
<td align="center" colspan="2"><input type="button"  Value=" Solve  " name="solve" onClick="solveform()"></td>
<td align="center" colspan="2"><input type="reset" value=" Reset  " name="reset" onClick="document.f1.volts.focus()"></td>

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

jsfunc.js

function solveform(){
var d=document.f1; var v1=d.volts.value; var o1=d.ohms.value; var a1=d.amps.value; var w1=d.watts.value;
if (a1 && o1){w1=Math.pow(a1, 2)*o1; v1=o1*a1;}
else if (a1 && v1){w1=a1*v1; o1=v1/a1;}
else if (v1 && o1){w1=Math.pow(v1, 2)/o1; a1=v1/o1;}
else if (w1 && a1){v1=w1/a1; o1=w1/Math.pow(a1,2);}
else if (w1 && v1){a1=w1/v1; o1=Math.pow(v1,2)/w1;}
else if (a1 && v1){w1=v1*a1; o1=v1/a1;}
else if (w1 && o1){v1=Math.sqrt(w1*o1); a1=Math.sqrt(w1/o1);}
d.amps.value=a1; d.volts.value=v1; d.watts.value=w1; d.ohms.value=o1;
v1=o1=a1=w1=0;
document.f1.reset.focus();
}