ma come l'hai usato

vedi se così va bene:
codice:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>Pagina senza titolo</title>
<script language="javascript" type="text/javascript">
// <!CDATA[

function Button1_onclick() 
{
    var x = 94.8 * 0.95;
    document.getElementById("div1").innerHTML = x;
    document.getElementById("div2").innerHTML = fix(x);
}

//------------------------------------------------
//Arrotonda number a dec cifre
//se dec non è specificato, arrotonda a 10 cifre
//------------------------------------------------
function fix(number, dec)
{ 
    var n =(dec >=0)? Math.pow(10,dec) : 1e10; 
    return Math.round(number * n) / n; 
}
// ]]>
</script>
</head>
<body>
    <input id="Button1" type="button" value="button" onclick="return Button1_onclick()" />
    

    <div id="div1">
    </div>
    <div id="div2">
    </div>
</body>
</html>