BLOQUER CERTAINES TOUCHES

<script>
//juste pour checker si cest netscape/mozilla
var isNS4 = (navigator.appName=="Netscape")?1:0;
</script>
<form onSubmit="return false;">

Ce champ ne va pas accepter les charactères: !@#$%^&* etc. <br>

<textarea rows=2 cols=20 name=sansnom onKeypress="if(!isNS4){if ((event.keyCode > 32 && event.keyCode < 48) || (event.keyCode > 57 && event.keyCode < 65) || (event.keyCode > 90 && event.keyCode < 97)) event.returnValue = false;}else{if ((event.which > 32 && event.which < 48) || (event.which > 57 && event.which < 65) || (event.which > 90 && event.which < 97)) return false;}"></textarea>

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Ce champ ne va pas accepter les " ou ' <br>

<input type=text name=sansnom onKeypress="if(!isNS4){if (event.keyCode==34 || event.keyCode==39) event.returnValue = false;}else{if (event.which==34 || event.which==39) return false;}">

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Ce champ accepte seulement les nombres<br>
<input type=text name=txtPostalCode onKeypress="if(!isNS4){if(event.keyCode < 45 || event.keyCode > 57) event.returnValue = false;}else{if(event.which < 45 || event.which > 57) returnfalse;}">
</form>