How to automatically invoice all packing slip updated sales orders

Hi All,

Is there an easy way to specify a batch to automatically invoice all currently uninvoiced sales packing slips?

I know there is an invoice window under the AR->Periodic menus that allows you to select all open sales packing slips and invoice them, but as far as I know the you need to open this window to select the ones to invoice each time.  My client is currently using this functionality at the end of each day to select all uninvoiced packing slips for invoicing and then invoice them in a batch.  They want to know however if there was an easy way to make this more automated than having to go into this window each time.

In other words, have a batch automatically select and invoice (and do the printing/emailing etc of invoices) all uninvoiced packing slips at the end of each day without user intervention.

Any help is appreciated!

Thanks,

Craig.