Msg#: 3582286 posted 9:26 pm on Feb 22, 2008 (gmt 0)
You should be able to do what you want to do using the scheduling tool in Adwords.
In Edit Campaign Settings, set your daily campaign budget to 100 pounds. Next turn the ad scheduling on. Then switch the ad scheduling to advanced mode. Finally, you can bulk edit your campaign to run 100% on the weekdays and 40% on the weekends. Be sure to save your changes when you're done.