failover and balancing

Hi ok so far iv been using the pcc examples but still hungry for more so we have experienced cable theft and had no internet running but i went and bought some mikrotik sxt5n units 4 to be exact so i have 3 internet connections now 2 adsl lines and one diginet one so the sxt i setted up using ospf and my rb750g also setted up well to use my new diginet / wireless link now pcc is anoing me cuz it splits traffic i want it to use one line till capacity is full then start using other line and so on… but if one fails to go out to google or what ever the case may be it must use the other two interfaces and if they both are down it must use the one avalible. aney idea?

balancing use pcc
failover use script
if you want balance and fail over
http://wiki.mikrotik.com/wiki/Load_Balancing_over_Multiple_Gateways
http://wiki.mikrotik.com/wiki/Manual:PCC ( i like this one )

is there a script example i can use?