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Blank page when including jQuery
function site_header(){

echo "<html dir="rtl">
<!DOCTYPE HTML>
<html>
<head>
    <meta name="viewport" content="width=device-width; initial-scale=1.0; maximum-scale=1.0;">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <title>Arabsfun :: تسالي العرب</title>
    <link href="css/style.css" type="text/css" rel="stylesheet">";

 echo Pulse::css();
 echo Pulse::javascript();

echo "</head>

<body>
<div id="wrap">

    <div class="header">
        <div class="logo">
            <a href="index.php"><img src="images/logo.png" alt="Arabsfun" /></a>
        </div>

        <div class="clear-float"></div><br>

    </div>
            <div class="content">" . navbar() .

           " </div>
        </center>" ;
}

<link href="css/style.css" type="text/css" rel="stylesheet">
<script type="text/javascript" src="jquery.js">