Untitled

<form name="kalkulator" action=" " method="post">
<p>tall 1:<input type="text" name="tall1"></p>
<p>tall 2:<input type="text" name="tall2"></p>
</p><input type="submit" value="Vis"></p>
</form>

<?php
$var1 = $_POST['tall1'];
$var2 = $_POST['tall2'];
$tiss = var1 + var2;
echo "$var1 ganger $var2 er lik $tiss";
?>