bgp multipath ?? Help needed

[HL]

Hello,

I've tried this config in order to achive multipath some-load balance 
and fail over with bgp
but with no luck..
bgp prefers one of the default GWs,
so I had to use static multipath to achieve it, but this is for 
operating reasons only,
I would like bgp to do it
What is wrong with my config ???

Thanks
Harry
--------------------------
log syslog all;
router id 10.0.173.254;
protocol device {
        scan time 10;
}
protocol kernel {
        export all;
        scan time 15;
}
protocol static {
        preference 150;
        route 0.0.0.0/0 multipath
        via 10.0.11.1  weight 100
        via 10.0.12.1  weight 5;
    }

protocol static static_bgp {
        import all;
    route 10.0.0.0/8 reject;
        #route A.B.C.0/24 reject;
        #route D.E.F.0/24 reject;
}

protocol bgp c2811_1  {
        import all;
        export where proto = "static_bgp";

        local as 64580;
        neighbor 10.0.11.1 as 64561;
}

protocol bgp c2811_2 {
        import all;
        export where proto = "static_bgp";
        local as 64580;
        neighbor 10.0.12.1 as 64562;
}
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