contenuto in base a una select

[Vindav]

Una cosa del genere intendi?

<select name="sel" onchange="caricaDiv(this);">
<option value="">Seleziona Contenuto</option>
<option value="auto">Auto</option>
<option value="moto">Moto</option>
<option value="case">Case</option>
</select>
<div class="auto" id="auto" style="display:none">Contenuto Auto</div> 
<div class="moto" id="moto" style="display:none">Contenuto Moto</div>
<div class="case" id="case" style="display:none">Contenuto Case</div>

function caricaDiv(myselect){
	 if(myselect.options[myselect.selectedIndex].value == "auto"){
	     document.getElementById("auto").style.display = "block";
	     document.getElementById("moto").style.display = "none";
	     document.getElementById("case").style.display = "none";
	 }
	 if(myselect.options[myselect.selectedIndex].value == "moto"){
	     document.getElementById("auto").style.display = "none";
	     document.getElementById("moto").style.display = "block";
	     document.getElementById("case").style.display = "none";
	 }
	 if(myselect.options[myselect.selectedIndex].value == "case"){
	     document.getElementById("auto").style.display = "none";
	     document.getElementById("moto").style.display = "none";
	     document.getElementById("case").style.display = "block";
	 }
}