Calendar Events Spanning Table Cells

I've decided after several failed attempts this is too difficult to do
on my own. I know it's been done before and a tutorial or code must
by lying around somewhere.

I have a Weekly Calendar

It's in a table with 7 columns and 22 rows

Across the top I have Monday thru Sunday

Down the side I have half-hour time increments - 8:00am - 10:00pm

I would like to display my events on the table, corresponding to their
day and time. If it spans several hours I would like the event to
span several rows.

Basically look like an Outlook Calendar.

I've tried this myself with five dozen if/then statments and embedded
loops but it's a huge mess.

I'd like to find out how to simply do this in asp (not ready for .net yet), any
ideas?