For form tag you must have define action page.
You should add like this
<form method="post" action="actionpage.php">
then create actionpage.php to retrive submit value from contact us page.
i downloaded a web template and this is the code for the contact us form..
<div id="contact" class="clear" ><br=""> <h2>Contact Us</h2>
<div class="fl_left">
<form method="post" action="#">
<label for="fullname">Name:</label>
<input type="text" name="fullname" id="fullname" value="">
<label for="validemail">Email:</label>
<input type="text" name="validemail" id="validemail" value="">
<label for="message">Message:</label>
<textarea name="message" id="message" cols="45" rows="10"></textarea>
<button type="submit" value="submit"><span>Submit</button>
</div>
except when i press submit it doesnt do anything, im not really very good at coding, but from what ive seen the "action" needs to be a php script, which the template doesnt have, if someone can post a script that will work, that would be great, ive tried for ages messing about editing scripts and it just wont work, thanks in advance, and any help will be appreciated.. if it make any difference the template is from os templates

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