nav_header.php

 <header>
      <nav class="navbar navbar-expand-md navbar-dark fixed-top customNav">
         <a class="navbar-brand" href="index.php"> 
			 <img style="height: 50px; width: 200px; border-radius: 10px;" src="images/bb.png"/>
			<!--<h2 style="color:#ffff55; text-shadow: 0px 0px 0px #ffff00"><b>.:| BDA 2018 |:.</b></h2> -->
		  </a>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarCollapse" aria-controls="navbarCollapse" aria-expanded="false" aria-label="Toggle navigation">
          <span class="navbar-toggler-icon"></span>
        </button>
        <div class="collapse navbar-collapse" id="navbarCollapse">
          <ul class="navbar-nav mr-auto">
            <li class="nav-item active custom">
              <a class="nav-link" href="index.php">Home</a>
            </li>

 <li class="nav-item dropdown active custom">
              <a class="nav-link dropdown-toggle" data-toggle='dropdown' href="#" role="button" aria-haspopup="true" aria-expanded="false">Organization</a>
              <div class="dropdown-menu">
                <a class="dropdown-item" href="organizing_committee.php">Organization</a>
                <a class="dropdown-item" href="steering_committee.php">Steering Committee</a> 
                <a class="dropdown-item" href="program_committee.php">Program Committee</a>
 
              </div>
            </li>


       <li class="nav-item dropdown active custom">
              <a class="nav-link dropdown-toggle" data-toggle='dropdown' href="#" role="button" aria-haspopup="true" aria-expanded="false">Calls</a>
              <div class="dropdown-menu">
                <a class="dropdown-item" href="cfp.php">Call for Papers</a>
                <a class="dropdown-item" href="pdf_files/BDA2018 CFP-v5.pdf" target="_blank">Download Call for Papers</a>
                <a class="dropdown-item" href="cft.php">Call for Tutorials</a>
		<a class="dropdown-item" href="cfw.php">Call for Workshops</a>
                <a class="dropdown-item" href="important_dates.php">Important Dates</a>
              </div>
            </li>

	   

            <li class="nav-item dropdown active custom">
			 <a class="nav-link dropdown-toggle" data-toggle='dropdown' href="#" role="button" aria-haspopup="true" aria-expanded="false">Conference Venue</a>
			    <div class="dropdown-menu">
			    <a class="dropdown-item" href="conference_venue.php">Conference Venue</a>
		<!--	    <a class="dropdown-item" href="registration.php">Registration</a> 
		 
			    <a class="dropdown-item" href="coming_soon.php">Accommodation</a>
			    <a class="dropdown-item" href="coming_soon.php">Transportation</a>
            <a class="dropdown-item" href="gallery.php">Gallery</a> -->
			    </div>
            </li>
            <li class="nav-item dropdown active custom">
              <a class="nav-link dropdown-toggle" data-toggle='dropdown' href="#" role="button" aria-haspopup="true" aria-expanded="false">Paper Submission</a>
              <div class="dropdown-menu">
		<a class="dropdown-item" href="paper_submission.php">Paper Submission</a>
                <a class="dropdown-item" href="important_dates.php">Important Dates</a>                

 
              </div>
            </li>
   <!--         <li class="nav-item dropdown active custom">
              <a class="nav-link dropdown-toggle" data-toggle='dropdown' href="#" role="button" aria-haspopup="true" aria-expanded="false">Technical Program</a>
              <div class="dropdown-menu">
             <a class="dropdown-item" href="coming_soon.php">Accepted Papers</a>
                <a class="dropdown-item" href="coming_soon.php">Program Schedule</a>
                <a class="dropdown-item" href="keynote_speakers.php">Key Note Speakers</a>
                <a class="dropdown-item" href="coming_soon.php">Invited Speakers</a>
                <a class="dropdown-item" href="calls_for_tutorial.php">Tutorials</a>

              </div>
            </li> -->
           
            
            <li class="nav-item dropdown active custom">
              <a class="nav-link dropdown-toggle" data-toggle='dropdown' href="#" role="button" aria-haspopup="true" aria-expanded="false">Other Information</a>
              <div class="dropdown-menu">
        <!--        <a class="dropdown-item" href="visa_information.php">Visa Information</a> -->
                <a class="dropdown-item" href="past_conferences.php">Past Conferences</a>
                <a class="dropdown-item" href="about_warangal.php">About Warangal</a>
              </div>
            </li>
            <li class="nav-item active custom">
              <a class="nav-link" href="contact_details.php">Contact Us</a>
            </li>
          </ul>
        </div>
      </nav>
     
    </header>