load balancig

Hi...
I want to use a squid proxy to balance the load between some parent
proxies (some of them icp capable, some not)

I want the following (or something similar) behaviour:
   Ask the icp capable parents whether they have the page
        if yes fetch
   If no fetch the page from one of the proxies in wheightened round-robin
where the weight is dynamically changed to sum (average transfer speed of
the last 10 requests sent to this proxy, not counting pages already cached
by parent)

Is this possible??

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InfraRED of aurora-borealis/Veres Tibor
E-Mail: infrared@aurora-borealis.satimex.tvnet.hu