Adding checkbox values together - works but got small problem

[sodkgb]

This is my first time posting to the forum and welcome assistance to fix this javascript:

[HTML]<script language="JavaS cript">
<!--
function calculate(what) {
what.answer.val ue =0;
for (var i=1,answer=0;i< 6;i++)
answer += (what.elements['CourseOrder' + i].checked)&(what .elements['CourseOrder' + i].value-0);
what.answer.val ue = answer;
}
//-->
</script>

<form>
<INPUT type="checkbox" NAME="CourseOrd er1" VALUE="1" onclick="calcul ate(this.form)" ><br>
<INPUT type="checkbox" NAME="CourseOrd er2" VALUE="1" onclick="calcul ate(this.form)" ><br>
<INPUT type="checkbox" NAME="CourseOrd er3" VALUE="1" onclick="calcul ate(this.form)" ><br>
<INPUT type="checkbox" NAME="CourseOrd er4" VALUE="1" onclick="calcul ate(this.form)" ><br>
<INPUT type="checkbox" NAME="CourseOrd er5" VALUE="5" onclick="calcul ate(this.form)" ><br>

<input type="text" name="answer">

</form>[/HTML]

I want to change the values, but when the values are changed it does not work or even provide the correct value. It is treating is checkbox as 1 and doesn't see the value of the checkbox?

Any help welcome,

Kevin

[hsriat]

Replace what with document.forms[0] everywhere in the function.
And don't pass any argument to the function calculate()


Regards

[acoder]

The problem is caused by the shorthand notation "&". Try this instead:

if (what.elements['CourseOrder' + i].checked) 
  answer += parseInt(what.elements['CourseOrder' + i].value);