Question

here is a link to what im basing my code off of….but i want there to be more than 2 areas to type numbers in if that makes sense…so number 1, number 2, then number 3…etc

LINK

Ive tried to copy everything down but then adding

c=Number(document.calculator.number3.value); 
d=Number(document.calculator.number4.value);

<!-- Here user will enter 3rd number. -->   
Number 3: <input type="text" name="number3">  
<!-- Here user will enter 4th number. -->   
Number 4: <input type="text" name="number4">  

and changing the result to e=a+b+c+d
but then the calculator stops functioning

any help would be appreciated

Answer 1

Try – http://jsfiddle.net/GmDuE/

HTML

Number 1: <input type="text" name="number1">
Number 2: <input type="text" name="number2">
Number 3: <input type="text" name="number3">
Number 4: <input type="text" name="number4">

JS

<script language="javascript" type="text/javascript">
function multiply(){
a=Number(document.calculator.number1.value);
b=Number(document.calculator.number2.value);
c=Number(document.calculator.number3.value);
d=Number(document.calculator.number4.value);
m=a*b*c*d;
document.calculator.total.value=m;
}

function addition(){
a=Number(document.calculator.number1.value);
b=Number(document.calculator.number2.value);
c=Number(document.calculator.number3.value);
d=Number(document.calculator.number4.value);
m=a+b+c+d;
document.calculator.total.value=m;
}
</script>

etc.