<script language="JavaScript" type="text/javascript">
function piut( s){
if(s.value == '2'){
var inpNode = document.createElement('input');
inpNode.setAttribute('type', 'texte');
inpNode.setAttribute('value', '10');
inpNode.setAttribute('size', '4');
inpNode.setAttribute('id', 'nb1');
s.parentNode.appendChild(inpNode);
} else {
if ( document.getElementById('nb1') ){
s.parentNode.removeChild(document.getElementById('nb1'));
}
}
}
</script>
echo "<select name=\"ex\" onchange=\"piut(this)\">";
echo "<option value='1'>Multiplications</option>";
echo "<option value='2'>Additions à trous</option>";
echo "<option value='3'>Multiplications à trous</option>";
echo "</select>";
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