Donde estoy en textarea

[bet]

Algo así puede ser?
<pre>
&lt;html&gt;
&lt;head&gt;
&lt;title&gt; New Document &lt;/title&gt;

&lt;script language=&quot;JavaScript&quot;&gt;
&lt;!--
var nav4 = window.Event ? true : false;

function contar(evt){
// NOTE: Backspace = 8, Enter = 13
var key = nav4 ? evt.which : evt.keyCode;

if (key == 8){
if ((document.forms[0].msg.value.length - 1) &lt; 0){
return false;
}
else {
document.forms[0].tot.value = (document.forms[0].msg.value.length - 1);
}
}
else {
document.forms[0].tot.value = (document.forms[0].msg.value.length + 1);
}
}

//--&gt;
&lt;/script&gt;&lt;/head&gt;

&lt;body bgcolor=&quot;#FFFFFF&quot;&gt;

&lt;form method=post action=&quot;&quot;&gt;
&lt;textarea onKeyDown=&quot;contar(event)&quot; name=msg rows=10 cols=45&gt;&lt;/textarea&gt;
&lt;input readonly type=text name=tot size=5 maxlength=3&gt; Total de caracteres
&lt;/form&gt;
&lt;/body&gt;
&lt;/html&gt;
</pre>


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