Validate Formulier Error

<div id="toprechts">
<form method="post" action="">
<input class="showon" name="topshowsession" type="submit" value="Info"/>
<input class="clear" name="topclear" type="submit" value="eXit"/>
<input class="showoff" name="topchoosegame" type="button" value="Spel"/>
<input class="showtaaloff" value="NL" name="toplanguage" type="button"/>
<input class="showon" name="topingelogd" type="submit" value="Login"/>
<input type="hidden" name="tophidden"/>
</form>
</div>

document type does not allow element "input" here; missing one of "ins", "del", "h1", "h2", "h3", "h4", "h5", "h6", "p", "div", "address", "fieldset" start-tag.

…me="topchoosegame" type="button" value="Spel"/>

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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>").