error message: document type does not allow element "FORM" here

hi there,


i tried to validate this site:

http://validator.w3.org/check?verbose=1&uri=http%3A//www.blacmox.de/sites/contact.htm


the reason for failing the validation is the form inside the inline-element <span> but i see no possibility to realize a reasonable style-concept without applying a box-based layout that reverts to an element that has no properties itself.

do you have suggestions ? 


many greets from germany + thanks for your work,
so:ren