CSS and Javascript registration in master page - sharepoint

CSS Registration

<SharePoint:CssRegistration name="<% $SPUrl:~sitecollection/Style Library/Styles.css %>" After="corev4.css" runat="server"/>

Javascript Registration

<SharePoint:ScriptLink ID="ScriptLink2" Name="~SiteCollection/_layouts/ProjectFolder.UI/js/jquery.js" runat="server"/>


<SharePoint:ScriptLink ID="ScriptLink3" Name="~SiteCollection/_layouts/ProjectFolder.UI/js/jquery.tipsy.js" runat="server"/>