Writing custom vb.net or c# in upload.aspx

Hello All,

I want to capture details about an image i.e. path, size etc through the file browser in FCK so I have set all the aspx configs correctly etc (all works ok); now all I have to do is capture the data and send it to the database I hold.

So my question is how do I capture the upload button click event from the FileBrowser/frmupload.html file in the upload.aspx page so I can write my custom logic? I thought of passing information through a query string and grabbing it on the upload.aspx page load and doing the db call then but I still don't know how to send the query strings because from what I can see all that the upload button does is check if a file is present and return false if not, then disable the upload button and change the text to in progress if there is a file! I found the target of the frmUpload which is frmUploadWorker but that is a frame on browser.html which simply calls a javascript:void(0) so that terminates any javascript...so now I am lost!

Any help is grately appreciated!...and thanks in advance for any of your comments