Ett litet script jag snickarade ihop nu. 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>Text</title>
<script language="JavaScript" type="text/javascript">
var text = "Hej och välkommen!";
var i = 0;
function writeText() {
document.frm.foo.value = text.substr(0, i++);
if (i <= text.length) setTimeout("writeText();", 200);
}
</script>
</head>
<body onLoad="writeText();">
<form name="frm">
<input type="text" name="foo" size="100">
</form>
</body>
</html>
