document.referrer and close()
===

I have the below script on a page, let's say "child.html".

I only want the browser to see the function `opener.opener = opener; opener.close()` if the referring URL is the one listed in the `if` statement of the script (parent.html), otherwise I don't want the browser to see it. 

The page that this script is on is a child page (a popup) of a parent page. Users (hopefully) will only access the parent page, which will subsequently open this child page and close the parent page at the same time using the `opener.opener = opener; opener.close()` function. 

The function works fine and does what I need it to do (closes the parent after opening the popup). **But**, if the child page URL is accessed directly (in other words without being directed from the parent page), then obviously there is no parent page to close and I get the script error:

'opener' is null or not an object

I understand the error message, hence why I'm trying to hide 'opener' if the referring URL **IS NOT** parent.html so that if someone happens to access the child page directly, opener is hidden and no error message. 

What do I need to change in the below script to make this work?



            <script type="text/javascript">
			//<![CDATA[<!--
			if (document.referrer != '../parent.html') {
            opener.opener = opener;
            opener.close();}
			else {}
            //-->
            //]]>
			</script>

Alternatively, I tried writing the following:

			<script type="text/javascript">
			//<![CDATA[<!--
			if (document.referrer = '../parent.html') {
			return false;
			} else {
            opener.opener = opener;
            opener.close();}
            //-->
            //]]>
			</script>

But that returns the script error: 'return' statement outside of function. Yes, I am a JS n00b =P

Thanks very much in advance for any help you can offer!