Using one VLAN over several WLANs without maxing out controller

Hi,
I need to provide several WLANs that need to have different SSIDs, but can all go on the same VLAN.
An example would be if i have 40 schools and one large, flat guest LAN that I want to use for them all. I'd like to put (SSIDs of)school0001, school0002, school000n etc onto this same VLAN without breaking my limit of 16 WLANs on the controller.
Does anyone know if the cisco 4404 (or 5508) can do this? and if so, how.
Thanks in advance,

The 16 wlan limit is hard set.
Here is a good reason why:
"... limit the number of service set identifiers (SSIDs) configured at the controller. Based on your access point model, you can have configured 8 or 16 simultaneous SSIDs, but as each WLAN/SSID needs separated probe responses, and beaconing, the RF pollution increases as more SSIDs are added. The results are that some smaller wireless stations like PDA, WiFi Phones and barcode scanners cannot cope with a high number of basic SSID (BSSID) information. This results in lockups, reloads or association failures. Also the more SSIDs, the more beaconing needed, so less RF space is available for real data transmits. "
from
http://supportwiki.cisco.com/ViewWiki/index.php/Wireless_LAN_Controller_%28WLC%29_Configuration_Best_Practices
You may want to consider using multiple controllers & limiting the # of wlans per controller.
You should also check into AP groups to limit what wlans are broadcast on what APs to help control the rf pollution where possible.

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Using one VLAN over several WLANs without maxing out controller

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