Hi all...

How do I add form elements together, I have tried many different ways but I always either get NaN or a concenated string (ie 15 + 16 + 1 + 52 = 1615152 != 84)?

<form>
<input type="text" name="field1" value="15">
<input type="text" name="field2" value="16">
<input type="text" name="field3" value="1">
<input type="text" name="field4" value="52">
<input type="button" value="Sum" onClick="sum(this.form)">
</form>

<script language="JavaScript"><!--
function sum(objRef) {
var result = 0;
result =+ objRef.field1.value - 0;
result =+ objRef.field2.value - 0;
result =+ objRef.field3.value - 0;
result =+ objRef.field4.value - 0;
alert(result);
}
//--></script>

Thanks....