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Need to change the value of a variable based on a selection box. (easy)

Hello,

I want to set the value of a variable outside of the scope of a function. Does this code accomplish that? What is a simple way that I can tell?

<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
<script type="text/javascript">
var url="";

function changeUrl(a) {
	if (a.value== "volvo") {
	url = "volvoPage.php"
	alert(url);
	return;
	}
	else { url= "saab.php"
	alert(url)
	return;}
}
</script>
<body>


<select onchange="changeUrl(this)">
  <option value="volvo">Volvo</option>
  <option value="saab">Saab</option>
  <option value="mercedes">Mercedes</option>
  <option value="audi">Audi</option>
</select>
</body>
</html>

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