javascript - text disappears rapidly after click on 'submit-button' -

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got problem. code:

<html>  <body> <form> <p>13-7: <input id="in1" type="text"" /><input type="submit" onclick="check(6, 'in1', 'out1')" value="tjek!"/></p> <p id="out1"></p> <p>20-7: <input id="in2" type="text"" /><input type="submit" onclick="check(13, 'in2', 'out2')" value="tjek!" /></p> <p id="out2"></p>    <script type="text/javascript">  function check(facit, input, output) {     var answer, evaluation;     answer = document.getelementbyid(input).value;     evaluation = (answer == facit) ? "correct" : "wrong";     document.getelementbyid(output).innerhtml = evaluation;     return false; }  </script> </form> </body>  </html>

when click submit-button, 'correct/wrong' shows moment. want stay on site, advice?

the submit buttons submitting form (so reloading page).

change buttons type="button".


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