In stead of replacing text branding, I divided into two rows like in the code below and gave img-responsive
class to the image......
<div class="collapse navbar-collapse navbar-ex1-collapse" style="background: #efefef; height:auto;">
<div class="container" style="margin-bottom:-1px;">
<div class="row">
<div class="col-md-3">
<div id="menubar-logo">
<a href="index.html"><img src="img/tl_logo.png" class="img-responsive" alt="Triple Luck IT Service Logo"></a>
</div>
</div>
<div class=" col-md-offset-3 col-md-6">
<ul class="nav navbar-nav">
<li><a href="index.php" class="active">Home</a></li>
<li><a href="about_us.php">About Us</a></li>
<li><a href="contact_us.php">Contact Us</a></li>
</ul>
</div>
</div>
<!-- end of "row" -->
</div>
<!-- end of "container" -->
</div>
<!-- end of "collapse" -->
and in addition,I added the following css codes.......
#menubar-logo img {
margin-top: 10px;
margin-bottom: 20px;
margin-right: 10px;
}
If my code solves your problem, it's my pleasure.....