Array Indexing possible in VHDL?

Thank you FvM for pointing out my mistakes. yes i meant k(natvar)...also the

delta*32

is not possible so i replaced it with

 delta(26 downto 5) & "00000"

. and the code works! thank you again for your help! on a side note, i am experiencing some weird simulation waveform where by after 64 counts, the cycle repeats itself again which is not suppose to happen (circled in red)

http://img811.imageshack.us/img811/8240/problemwy.jpg (http://imageshack.us/photo/my-images/811/problemwy.jpg/)

...any idea what happen?

Thanx tricky for bringing that natvar issue up...i'll try and figure it out...sorry for my mistakes...i'm a total newbie trying to learn haha