Insert image

Hy!

I write one imagebrowser plugin, but i dont no how to link to the editor.
What is the ajax command?

This is the inserting code, but dont insert to the editor.

function insertimg() {
  if (selected >= 0) {
    doc = frames['frm1'].document;
    img = doc.getElementById(selected);
    opener.document.forms[0].src.value = '<?php echo $IMGURL ?>/'+img.alt;
    window.close();
  }
}