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Hi Kool_Kid,
I've been working with VLANs since they were invented, and I don't think there is a way you can do exactly what you want. Whether you use 802.1q or ISL trunking, if you feed the output of a managed switch's trunk port into an unmanaged switch, the unmanaged switch will/may not recognise the tagging and will either reject or confuse the frames it receives.
There is a way that you might think might work after a fashion, but it kinda makes VLANs a waste of time...have one access port on the managed switch allocated to each one of the VLANs you want to send to the unmanaged switch.
On egress from the managed switch, the frames will be ordinary, untagged frames, which the unmanaged switch will deal with. As long as each VLAN is associated with a different subnet, you can then identify the frames from each VLAN by virtue of their Level 3 (IP) identity. However, the frames that come from VLAN 1(for example) will, in the unmanaged switch, be made available to the port on the managed switch associated with each other VLAN, so the separation you get in the managed switch is then lost by "feedback" from the unmanaged switch. In addition, this kind of setup is highly likely to completely mung the Spanning Tree Algorithm.
The only safe way to manage this is to have a separate unmanaged switch for each VLAN. Connect each of the unmanaged switches to Access ports of the managed switch, with each Access port associated with a different VLAN. That way you replicate the VLAN with physically separate real LANs.
HTH
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