Si fa cosi...

codice:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
<head>
<title>Untitled</title>
<style type="text/css">
<!--
.mioStilo  {display:none}
.mioStilo2 {display:block}
-->
</style>
<script language="JavaScript" type="text/javascript">
<!--
function view(aDiv) {
 aDiv.className =  aDiv.className == "mioStilo" ? "mioStilo2" : "mioStilo";
} 
//-->
</script>

</head>
<body>
Vedere 1
<div id="div1" class="mioStilo">
fdkjfnqskfnvslkjsdfv **ffsdflksdfv

v,lskdsdfvszdvfzsvfzsez

</div>

Vedere 2
<div id="div2" class="mioStilo">
fdkjfnqskfnvslkjsdfv **ffsdflksdfv

v,lskdsdfvszdvfzsvfzsez

</div>
</body>
</html>