trying to call a remote javascript file that gets info from php

Here's the deal, I am getting access denied froma script that I know should work, from what I understand.

I am calling .js file from one domain, which in the the script does a call to a php file on the same domain, yet I am still getting access denied.

example

<script type="text/javascript">
//some variables to set
</script>
<script type="text/javascript" src="http://www.site.com/folder/script.js">
</script>

Code (markup):

Now, withing the .js file I am calling a php from the same domain and folder, yet it's acting like I just called the php file from a different domain.

Here's snippet from the .js URL is the url to the php file. I only do this because the php file is getting info from a completely different domain.

var request = "http://www.site.com/folder/file.php";
try {
request = new XMLHttpRequest();

} catch (e) { request = new ActiveXObject("Msxml2.XMLHTTP"); }


request.open("GET",URL,false);
request.send();

document.write(request.responseText); 

Code (markup):

I need to be able to let others call this script.

 

got it all working, no idea what was going on, but in the end I've got to work out some iframe issues in wordpress.