[VE][65] Error Message Feedback

Hello,
 
I have some problems with the validation of my XHTML code. The problem is
that the validator do not accept a this form. If  i delete everything
between the form tags, my page is valid.
Here ist the code:
 
140: <form action="" method="post">

141: 

142: <input type="text" name="value" maxlength="12" size="15" />&nbsp;<input
type="submit" name="senden" value="Start!" />

143: 

144: </form>
The validator says
 
Line 142
<http://validator.w3.org/check?uri=http%3A%2F%2Fwww.synapstix.de%2FImages%2F
Control%2Fuser.htm%3Fseite%3D1&charset=%28detect+automatically%29&doctype=%2
8detect+automatically%29&ss=1&verbose=1#line-142> , column 57: document type
does not allow element "input" here; missing one of "p", "h1", "h2", "h3",
"h4", "h5", "h6", "div", "pre", "address", "fieldset", "ins", "del"
start-tag
 
 
best regards,
 
Michael Vogel