script helper in app_code

Content.cshtml

@using System.Web.Mvc;

@helper Script(string scriptName, UrlHelper url) {
    <script type="text/javascript" src="@url.Content("~/Scripts/" + scriptName)"></script>
}

example extracted from:

http://www.pluralsight-training.net/microsoft/players/PSODPlayer.aspx?author=scott-allen&name=mvc3-building-ajax&mode=live&clip=0&course=aspdotnet-mvc3-intro

 he explains the reasoning for passing in the reference to @Url