Bootstrap navbar menu toggle not working - toggle

the toggle in my bootstrap navbar used to work but now has stopped doing so and won't show the menu when I decrease the screen size. The code I used is:
</head>
<body>
<div class="container-fluid" id="wrapper">
<nav class="navbar navbar-default">
<div class="container">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#defaultNavbar2" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span><span class="icon-bar"></span></button>
<img src="images/logo.png" id="navbarlogo"></div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="defaultNavbar2">
<ul class="nav navbar-nav">
<li class="active"></li>
<li></li>
<li class="dropdown">
<ul class="dropdown-menu">
<li>Kontakt</li>
</ul>
</li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li>Über uns</li>
<li>Services</li>
<li class="dropdown">Kontakt<span class="caret"></span>
<ul class="dropdown-menu">
<li>Adresse</li>
<li>Impressum</li>
</ul>
</li>
</ul>
</div>
<!-- /.navbar-collapse -->
Any ideas what's happened? Thanks!

I should start by checking that my support files are in place (css and js). navbar needs javascript in order to work properly.

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This is how the menu should look in html
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[[$blogMenu]]
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[[+comments_enabled:is=`1`:then=`
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I figured it out. Somehow I had a class in my .css file (which I wasnt actually using) that was causing this anomaly. It took me a while to troubleshoot, but I finally figured out which one it was and removed it. It works fine now:)

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I am having a problem with JSTree. I am using very basic examples but the <ins class="jstree-icon"> </ins> are floated all the way over to the right hand side of the tree area.
Here is the JS that fires it off:
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Here is the HTML that I am using:
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Any suggestions or pointers appreciated.
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<div>
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It's not immediately clear where you're loading the images from. Are these images stored somewhere, online? Or are you trying to access images that are already stored on the device?
And is it correct to say that sometimes the images show up, and sometimes they do not? Have you had an instance where you've had all the images appear? Or is there always at least one image missing?

jQuery tabs are not working in IE 7 and IE 8

I am using jQuery Tabs in an asp mvc 2 application.
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<div id="home" class="menu">
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<li><a href="<%= Url.Action("GetDatesAndLocationTab", "Home") %>" class="a"><b>
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Now I changed the list code (to a new requirement). And now the tabs do not work in IE 7 and 8.(i.e the views for all the tabs appear in the first tab)
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Thanks