使用vbscript / classic asp确定资源的绝对URL

I've created a pseudo user control for a site written in classic asp. The control is simply an asp page (with full HTML headers and body) that resides within an iframe in the parent page. The point was to create an AJAX-like interface for uploading files asynchronously (the parent page contains a large form and I didn't want to have to upload the files and submit the rest of the form at the same time).I've created a pseudo user control for a site w