remove numbers from bookmarks

What do you mean "sublayers"?  This will remove the numbers from all bookmarks:

function RenameBookmark(bkm, nLevel)
{
for (var i = 0; i < nLevel; i++)
{
bkm.name=bkm.name.replace(/[0-9]/g,"");
}
if (bkm.children != null)
for (var i = 0; i < bkm.children.length; i++)
RenameBookmark(bkm.children[i], nLevel + 1);

}
RenameBookmark(this.bookmarkRoot, 0)

Do you have sub-bookmarks, too, or just the top-level ones?