While raising a Task, the field values(list box) should be populated based on the other field value selection. Example: Field1(Platform) ( Values: Windows, Linux, Solaris,etc.,) Field2(Version) ( Values: Windows=>2000,2003 and Linux=>2.4,2.6 and Solaris=>2.8,2.9,2.10)

If user selects Windows in Field1, Field2 should only be populated with 2000 & 2003.
If user selects Linux in Field1, Field2 should only be populated with 2.4 & 2.6
If user selects Solaris in Field1, Field2 should only be populated with 2.8,2.9,2.10.