Fixed CSS reference

install/install_functions.inc.php

@@ -779,7 +779,7 @@ function hesk_iHeader()
 	<link rel="stylesheet" href="../css/bootstrap.css">
     <link rel="stylesheet" href="../css/bootstrap-theme.css">
 	<link href="../css/hesk_style_v25.css" type="text/css" rel="stylesheet" />
-	<link href="../css/hesk_newStyle.css" type="text/css" rel="stylesheet" />
+	<link href="../css/hesk_newStyle.php" type="text/css" rel="stylesheet" />
 	<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
     <script src="../js/jquery-1.10.2.min.js"></script>
 	<script language="Javascript" type="text/javascript" src="../hesk_javascript_v25.js"></script>