I need to disable and enable some drop down list data according to conditions
I have two drop down lists.
Say, First ddlist has A,B,C,D,E,F and second ddlist has 1,2,3,4,5.
When I select C from the first ddlist, then 1,3,5 should be disabled in second ddlist.
And again if I select B from the first ddlist, 1,3,5 will b enabled and now 4 will be disabled in the second ddlist.
How can I get it with java Script pls help