this is the error...
document type : XHTML 1.0 Strict
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 .
…="f2c2d94452abe9a7ae1affebf8d1051d" />
✉
The mentioned element is not allowed to appear in the context in which you've placed it; the other mentioned elements are the only ones that are both allowed there and can contain the element mentioned. This might mean that you need a containing element, or possibly that you've forgotten to close a previous element.
One possible cause for this message is that you have attempted to put a block-level element (such as "<p>" or "<table>") inside an inline element (such as "<a>", "<span>", or "<font>").
this is the line....
# <div style="background-color: #ffffff; padding:10px;"><form action='details.php?image_id=687&sessionid=f2c2d94452abe9a7ae1affebf8d1051d' method='post' onsubmit='postbutton.disabled=true;'><input type="hidden" name="sessionid" value="f2c2d94452abe9a7ae1affebf8d1051d" />
#
# <div>Post comment</div>
# <div>
# <span><label for="user_name">Name:</label></span>
# <span><input type="text" name="user_name" title="Text input: Name" id="user_name" size="30" /></span>
# </div>