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                <nav class="navbar navbar-inverse  navbar-fixed-top"  role="navigation" >
                 <div class="container">
            <div class="navbar-header">
                <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
                    <span class="sr-only">Toggle navigation</span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
            <div id="navbar" class="navbar-collapse collapse">
                <ul class="nav navbar-nav">
                    <li class="active"><a   href="index.html"><span class="glyphicon glyphicon-home" aria-hidden="true"></span> Home</a></li>
                    <li><a href="aboutus.html">
                        <span class="glyphicon glyphicon-info-sign" aria-hidden="true"></span> About</a></li>
                    <li class="dropdown">
                        <a href="index.html" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false"> 
                      <span class="glyphicon glyphicon-list-alt" aria-hidden="true"></span> Menu <span class="caret"></span></a>
                        <ul class="dropdown-menu">
                            <li><a href="contactus.html#">Main Courses</a></li>
                            <li><a href="contactus.html#">Bootstrap</a></li>
                            <li><a href="contactus.html#">Asp</a></li>
                            <li><a href="contactus.html#">SQl</a></li>
                            <li role="separator" class="divider"></li>
                            <li class="dropdown-header">PHP</li>
                            <li><a href="contactus.html#">MySQl</a></li>
                    <li><a href="#"><span class="fa fa-envelope-o"></span> Contact</a></li>
               <ul class="nav navbar-nav navbar-right">
                   <li><a data-toggle="modal" data-target="#loginModal"><span class="glyphicon glyphicon-log-in"></span> login</a></li>
    <div id="loginModal" class="modal fade" role="dialog">
        <div class="modal-dialog">
        <div class="modal-content">
            <div class="modal-header">
                <button type="button" class="close" data-dismiss="modal"> &times;</button>
            <div class="modal-body">
                   <form class="form-inline">
                   <div class="form-group">
                       <label class="sr-only" for="email">Email</label><input type="text" class="form-control input-sm" placeholder="Email" id="email" name="email">
                        <div class="form-group">  
                           <label class="sr-only" for="password">Password</label>
                                     <input type="password" class="form-control input-sm" placeholder="Password" id="password" name="password"></div>
                       <div class="checkbox">
                       <input type="checkbox"> Remember me
                       <button type="submit" class="btn btn-info btn-xs">Sign in</button>
                       <button type="button" class="btn btn-default btn-xs" data-dismiss="modal">Cancel</button> 
            <div class="modal-footer">
                <div style="padding:10px"></div>


                <link href="" rel="stylesheet">