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H BRIDGE, driver for a dc motor

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i am designing a 6 amps h bridge bidirectional dc motor driver ckt.

the current rating is 4amps @ 12v..

i m using a pmos on top and nmos on bottom.

the prob is that the upper pmos is getting hot like anything.
i used a transisitor to drive the upper mosfet and a logic level +5v for the lower one.
i even tried connecting one cap(i microfarad) and one resistor(one kiloohm) b/w
gate and gnd,but in vain.

can anyone suggest some tested soln to this prob please...

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