directing external.js to subdirectory

[darkfact]

Is there a way in javascript to get the name of the file currently using an external.js?

If I have files named test.html, test2.html, test3.html, etc. and I want to get to a file in a subdirectory with the same name as the html file from an external js. Is there a way to do this?

This is the function in my external js that I want to be able to direct to the subdirectory with the same name as the html file currently using the external js.

function change2()
{
 
top.parent.leftside.iframe1.location="test/file.html";
 
}
 
 

file.html has the same name in every subdirectory.
So I want this function to go to a subdirectory with the same name as the html page currently using the external js.

thanks in advance for any suggestions.

[darkfact]

I came up with an answer to part of my question. I can get the file name with this code:

var file = location.href.substring(location.href.lastIndexOf('/')+1);
 
    var fileName =file.split('.');
 

Now, if I can figure out how to use that information I'll be set.

[darkfact]

Well, it was actually pretty simple. It just took me a while to figure it out.

 
function change2(){
var file = location.href.substring(location.href.lastIndexOf('/')+1);
var fileName =file.split('.',1);
var gotoplaylist = [fileName] +  "/" + 'playlist.html';
 
top.parent.center.location="test4.html";
 
top.parent.leftside.iframe1.location.href = [gotoplaylist];
}