jak przerobic ten kod, aby zamiast ("," - jak teraz jest) byla "." (kropka), ktora moze byc tylko raz wcisnieta?

[HTML] pobierz, plaintext 
<script type='text/javascript'>jQuery(function($){$('.ctype_digit_dot').keypress(function(e){return e.which === 8 || e.which === 0 || (e.which === 44 && this.value.indexOf(',') === -1) || (e.which >= 48 && e.which <= 57);});});</script>
[HTML] pobierz, plaintext 

<script type='text/javascript'>jQuery(function($){$('.ctype_digit_dot').keypress(function(e){return e.which === 8 || e.which === 0 || (e.which === 46 && this.value.indexOf('.') === -1) || (e.which >= 48 && e.which <= 57);});});</script>

zrobione