Complex (?) Q: Run Asp Script / Reload Form List?

What I'm currently doing is returning a list of images in a directory via a form list. I'm an asp guy so vbscript is the way I'm doing this:

<select name="image" size="10" onChange="generateimage(this.options[this.selectedIndex].value)" align=left>
<%
Dim FSO
Dim Files
Dim File
Dim Count
Set FSO = Server.CreateObject("Scripting.FileSystemObject")
Set Files = FSO.GetFolder(Server.MapPath("./moms_images/")).Files
Set FSO = Nothing
Count = 0
For Each File In Files
Select Case LCase(Right(File.Name, 3))
Case "jpg", "gif", "bmp", "png"

Response.Write "<option value='" & File.Name & "'>" & File.Name & "</option>"

End Select
Next
Set File = Nothing
Set Files = Nothing
%>
</select>

What I *hope* to be able to do is allow a file upload (also vbscript) from a pop-up window and, when the upload is complete, refresh the list (above) without reloading the page (AJAX fever, methinks)

The only thing that would make it even cooler would be to auto-select / display the newest upload otf (I use dhtml to display the images on-select ala dynamicdrives example).

I realize this is a fairly tall order, but would be greatful for any pointers or weblinks for this js-challenged soul to use to get started.