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HTML

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<form name="form1" id="form1" method="post" target="_blank" action="https://www.deltaplan.dk/deltaplan_route/index_continue.php" onSubmit="window.open('', 'deltaplan_login', 'location=no,toolbar=no,status=no,menubar=no,width=780,height=580,scrollbars=yes,resizable=yes'); this.target = 'deltaplan_login';document.getElementById('form1').reset();">
<p><label>Brugernavn:</label> <input type="text" name="username" size="16" maxlength="16" value="OST-"></p>
<p><label>Adgangskode:</label> <input type="password" name="password" size="16" maxlength="16"></p>
<p><label>&nbsp;</label> <input class="envor-btn envor-btn-normal envor-btn-primary" type="submit" name="submit_login" value="Log ind"> </p>
</form>