Is there any function to retrieve top most directory from a give site?

[Eng Born]

I put all image in /image. It was working fine many years ago. Now, I have to change to
var url = "http://jinpusa.angelfire.com/image/"; this in order to have it work correctly.
I want this code to be portable and bring to any web site without having to edit it.
Is there any alternative for not specifying the whole path?

function init_image()
{
//      var url = "http://jinpusa.angelfire.com/image/";
//     var url = "http://mysite.verizon.net/solang/image/";
//     var url = "./";
      var url = "/image/";
       pieces[ 0]="SQUARE.JPG";
//       pieces[ 0]="NPAWN.JPG";
       pieces[ 1]="NPAWN.JPG";
       pieces[ 2]="NFPAWN.JPG";
.
.
       for (var i=0; i<pieces.length; i++)
       {
           pieces[i] = url + pieces[i];
       }
}

[Dormilich]

if the image folder is always in the same place from the root directory, you can try

var url = "http://" + location.hostname + "/image/";

[Eng Born]

You suggestion is almost correct, but it gave me
http://mysite.verizon.net/image/
instead of the correct one like
http://mysite.verizon.net/solang/image/
I still have no clue how to add owner of a given web site.
Thanks,
Eng

[Eng Born]

The problem is complicated, at least two different servers like Verizon and Angelfire have different way of assigning its user the web location/directory.
verizon gives http://mysite.verizon.net/solang
while angelfire gives
http://jinpusa.angelfire.com/.
With the old way, / worked for both site in assging top most directory and HTTP new version remove that.
Your suggestion work perfectly for angelfire, but it won't work on Verizon.

[Dormilich]

then you can only use relative paths

[Eng Born]

That won't do neither because player might put his/her page down the directory tree. I just have to let the user edit the file to put his/her topmost web site.
Anyway, thanks.