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Adaptar o tamanho do select ao conteúdo

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Eu tenho este código aqui:

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">

<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
<script type="text/javascript" src="js/classListSubstitute.js"></script>
<script type="text/javascript"></script>

	<script type="text/javascript">

var multipleSelects = 
	function () {

		var uniqueId = -1;

		return function theMultipleSelects (targetPlace, showDeleteButton){

				this.targetPlace = targetPlace;
				this.container = document.createElement('p');


				this.labelsNames = ['Company', 'Profession'];
				this.idsAndNames = ['select_company', 'select_work'];
				this.options = 	[
								 {'value': 'this', 'text': 'My company'}, 
								 {'value': 'Other', 'text': 'Other company'} //the last one has no comma!
				// Here you tell where is the information about the dates
				// Each position in the main array shows where date, month, year (by this order) for each date that exists.

				this.selects = new Array (this.labelsNames.length);
				this.multipleSelects = new Array (this.labelsNames.length);
				this.labels = new Array (this.labelsNames.length);

				for(var i = 0; i < this.labels.length; i++){
					this.labels[i] = document.createElement('label');
					this.labels[i].innerHTML = this.labelsNames[i] + ':';
					this.labels[i].setAttribute("for", this.idsAndNames[i]+ '' + uniqueId);

					this.selects[i] = document.createElement('select');
					this.selects[i].setAttribute("id", this.idsAndNames[i] + '' + uniqueId);
					this.selects[i].setAttribute("name", this.idsAndNames[i] + '[]');

					this.multipleSelects[i] = document.createElement('select');
					this.multipleSelects[i].setAttribute("id", 'multiple_' + this.idsAndNames[i] + '' + uniqueId);
					this.multipleSelects[i].setAttribute("name", 'multiple_' + this.idsAndNames[i] + '[]');
					this.multipleSelects[i].setAttribute("multiple", 'multiple');
					//this.multipleSelects[i].setAttribute("size", '3');

					// Create the special empty space to force the user to choose one option
					var option = document.createElement('option');
					option.value = '';
					option.innerHTML = '';
					option.disabled = "disabled";
					option.selected = "selected";

					// Create all options in the main select
					for( var j = 0; j < this.options.length; j++){
						option = document.createElement('option');
						option.value = this.options[j].value;
						option.innerHTML = this.options[j].text;

					// Create the way to copy all the user selects to the multiple select

					// First a listener
					var copyOption = 
						function (select, multiple) {
							var removeFromSelect = 
								function (e){
							return function (e){
								var newOption = select.options[select.selectedIndex].cloneNode(true);
								newOption.addEventListener('click', removeFromSelect, false);
								multiple.add(newOption, null);
						}(this.selects[i], this.multipleSelects[i]);

					this.selects[i].addEventListener('change', copyOption, false);

				for(var i = 0; i < this.multipleSelects.length; i++){



<script type="text/javascript">

	window.onload = function (){

		multipleSelects = multipleSelects();

		new multipleSelects(document.getElementById('multipleSelectbox'), true);

				function (){
					 new multipleSelects(document.getElementById('multipleSelectbox'), true);
			, false);


<style type="text/css">
	.wrongValue {
		border-color: red;

		overflow:scroll; /* Make it always scrollable */


<form method="post" action="" enctype="multipart/form-data">
	<div id="multipleSelectbox">
		<img src="img/plus.png" id="newMultipleSelectInputLine" title="adicionar linha">



O que ele faz é simples. O js controla e mantém as referencias para cada um dos nodes do HTML que cria. O que ele cria é um select box e um selectbox multiple. O CSS dá ordem para o selectbox ter o tamanho correspondente.

O meu objetivo é simples. Como é que eu consigo obter o comportamento que obtenho no selectbox multiple segundo a especificação do HTML5 de modo a comportar-se exatamente igual a como se comporta no firefox 3.6.16 usando exclusivamente CSS?

Ou seja: Eu tenho um certo comportamento no firefox 3.6.16 quero que se comporte da mesma maneira no firefox 4 e tudo tem que ser controlado em CSS.

"[Os jovens da actual geração]não lêem porque não envolve um telecomando que dê para mirar e atirar, não falam porque a trapalhice é rainha e o calão é rei" autor: thoga31

Life is a genetically transmitted disease, induced by sex, with death rate of 100%.

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