i have an unique scenario

i have three picklist fields 

a) comp1-pickilst values (A , B , C , D , E , F )

b) comp2- picklist values (A, B , C , D , E , F)

c) comp3-multiselect values (A, B , C , D , E , F)

if i select the value A in comp1, i just want (B , C , D , E , F) to appear as option for comp2

similarly , if i select A in comp1 and and c in comp2 , i want the available picklist for the comp3 to be (B,D,E,F)

what should i do to implemnet this logic . i thought of dependent picklist but i dont know how to make a third field dependent on the value of two prior fields . hope i am making my case clear 

i want to have a pop up on standard pagelaout which is using a VF . this VF shud only be rendered if and only if a certain field has a conditional value and also the VF pop up shud ultimately pupulate the data in the output page  . my idea is to override the save button . any help will be very much welcome

thanks to all those who are making teh VF learning for newbies like us a cake walk

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i have an unique scenario

i have three picklist fields 

a) comp1-pickilst values (A , B , C , D , E , F )

b) comp2- picklist values (A, B , C , D , E , F)

c) comp3-multiselect values (A, B , C , D , E , F)

if i select the value A in comp1, i just want (B , C , D , E , F) to appear as option for comp2

similarly , if i select A in comp1 and and c in comp2 , i want the available picklist for the comp3 to be (B,D,E,F)

what should i do to implemnet this logic . i thought of dependent picklist but i dont know how to make a third field dependent on the value of two prior fields . hope i am making my case clear 

i want to have a pop up on standard pagelaout which is using a VF . this VF shud only be rendered if and only if a certain field has a conditional value and also the VF pop up shud ultimately pupulate the data in the output page  . my idea is to override the save button . any help will be very much welcome

thanks to all those who are making teh VF learning for newbies like us a cake walk