1 - Autoresize vertical d'un textarea
<script>
function redimtextareas(obj){
obj.style.height='500px';
obj.style.height = obj.scrollHeight + 20 + 'px';
}
</script>
html:
<textarea name="nom" onFocus="redimtextarea(this);" onKeydown="redimtextarea(this);"></textarea>
css:
textarea{overflow:hidden; /* éviter les scrollbars*/}