So, I'm relatively new to JavaScript and I was wondering how I would add the values from two inputs and echo out the result. Here's what I have so far:

```
function math (form) {
    var input1 = form.input1.value;
    var input2 = form.input2.value;
    var input3 = input1 + input2;
    document.write (input3);
}

```

```xml
<form action="" method="GET">
   <input type="text" name="input1">
   <input type="text" name="input2">
   <input type="button" name="button" onClick="math(this.form)">
</form> 

```

I expected that when I entered a number into each input it would spit out the sum of the two numbers. Instead it just prints both numbers individually. 

How can I get it to print the sum of the two numbers?