JavaScript - ^ Operator

I'm trying to not allow my users to enter in n/a in my form ex... "N/A" "n/A" "na"

My code trips the alert every time no matter what is entered in the cell... Why is it doing that?

Code:

function appliance() {
if (document.ComplianceForm.Appliance.value=="n/a" || "N/A" || "n/A" || "N/a") {
alert("You cannot enter any variation of n/a in this cell.")
}
else {
return false;
}; 
	}

Hello I have a question which has been bugging me for a while now so have decided to ask it on CF.

In PHP you can use the '&' symbol as a function operator for example like so.
PHP Code:
function demoFunc(&$output='') {
  for($i=1;$i<count(func_get_args());$i++) {
    $output .= ' '.func_get_arg($i);
  }
  $output = trim($output);
} 


As you can see the '&' symbol was used in the argument section to allow the function to be used like this demoFunc($output,'hello','world'); print $output;

My question is how can I do this in JavaScript to do the same thing like use the variable used in the function argument section and use it like it would be used in PHP?

Thank you
- DJCMBear

I read somewhere (I think from Douglas Crockford) that void is a completely useless operator. What is its actual purpose? Is there anything it's good for?

I see lots of javascript:void(0) hyperlinks all over the place. From what I gather, it just disables the link's default behavior...buy why not just make the href="#" or return false from an onClick handler?

Can anyone enlighten me?

Code:

this.delete = function(obj)
{
..

Is that it ? I can't have delete ? Or can this be written in some other way, including delete ?

I'm still learning js core using Flanagan's 5th ed.
so please bear with me; is the if ("ignore" in arguments.callee) return;
below valid or a typeo?
Thanks J.
Code:

function inspect(inspector, title) {
    var expression, result;

    // You can use a breakpoint to turn off subsequent breakpoints by
    // creating a property named "ignore" on this function.
    if ("ignore" in arguments.callee) return;
.......