tow sub tab formatting in html

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CSS

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HTML5

i try to create sub tabs in html but there is formatting is out .. In blank tab there is a sub tab conferences and also from conferences sub tab there is also two another sub tabs e.g. Conference 1 and conference 2 .. but conference 1 tab is not visible so how i done this below is html code

<div id="menu">
<ul class="navbar">
<li><a href="">TAB1</a></li>
<li><a href="#">TAB2</a>
<ul id="Ul1">
<li><a id="A1" href="">SUB1</a></li>
<li><a href="">SUB2</a></li>
<li><a href="">SUB3</a></li>
<li><a href="">SUB4</a></li>
<li><a href="">SUB5</a></li>
<li><a href="">SUB6</a></li>
<li><a href="">SYB7</a></li>
</ul>
</li>
<li><a href="">TAB3</a>
<ul id="Ul2">
<li><a id="A2" href="">SUB1</a></li>
<li><a href="">SUB2</a></li>
<li><a href="">SUB3</a></li>
</ul>
</li>
<li><a href="">tab4 </a></li>
<li><a>tab5</a>
<ul id="Ul4">
<li><a id="A4" href="">sub1 </a></li>
<li><a href="">sub2</a></li>
<li><a href="">sub3</a></li>
</ul>
</li>
<li>
<a href="">UP COMING EVENTS</a>
<ul id="Ul3">
<li class="b"><a id="A3" href="#">Conferences</a>
<ul class="c">
<li class="a"><a href="">I 2015 conference</a></li>
<li class="a"><a href="">Kuala Lampur conferences</a></li>
</ul>
</li>
<li><a href="">Workshps</a></li>
<li><a href="">Seminars</a></li>

</ul>
</li>

                 
<li><a href="">Research</a>
<ul id="subnavlist">
<li class="b"><a id="subcurrent" href="#">sub1</a>
<ul class="c">
<li class="a"><a href="">sub sub1</a></li>
</ul>
</li>
<li><a href="">sub2</a></li>
<li><a href="">sub3</a></li>
</ul>
</li>
 

<li id="active"><a href="">tab8</a></li>
</ul>
</div>

css

.navbar {
      height: 50px;
        border-right: 1px solid #54879d;
       
        margin: 0px;
        padding: 0px;
        position:absolute;
        margin-left:40px;
        
         
  }
	
	.navbar li 	{
			height: auto;
			width: 131px;  /* Each menu item is 150px wide */
			float: left;  /* This lines up the menu items horizontally */
			text-align: center;  /* All text is placed in the center of the box */
			list-style: none;  /* Removes the default styling (bullets) for the list */
			font: normal bold 12px/1.2em Arial, Verdana, Helvetica;  
			padding: 0;
			margin: 0;
			background-color: #366b82;
                        }
                        
                        
                        .navbar a	{							
		padding: 18px 0;  /* Adds a padding on the top and bottom so the text appears centered vertically */
		border-left: 1px solid #54879d; /* Creates a border in a slightly lighter shade of blue than the background.  Combined with the right border, this creates a nice effect. */
		border-right: 1px solid #1f5065; /* Creates a border in a slightly darker shade of blue than the background.  Combined with the left border, this creates a nice effect. */
		text-decoration: none;  /* Removes the default hyperlink styling. */
		color: white; /* Text color is white */
		display: block;
		}
		
		.navbar li:hover, a:hover {background-color: #54879d;} 
		
		
		.navbar li ul 	{
		display: none;  /* Hides the drop-down menu */
		height: auto;									
		margin: 0; /* Aligns drop-down box underneath the menu item */
		padding: 0; /* Aligns drop-down box underneath the menu item */			
		}				

.navbar li:hover ul 	{
                        display: block; /* Displays the drop-down box when the menu item is hovered over */
                        }
                        
                        .navbar li ul li {background-color: #54879d;} 
                        
                        
                        .navbar li ul li a 	{
		border-left: 1px solid #1f5065; 
		border-right: 1px solid #1f5065; 
		border-top: 1px solid #74a3b7; 
		border-bottom: 1px solid #1f5065; 
		}
				
.navbar li ul li a:hover	{background-color: #366b82;}

.navbar li ul li ul li {
      margin-top:-50px;
      margin-left:130px;
      display:block;
  }
  .b:hover .a {
      visibility:visible;
      display:block;
  }
  .a {
      margin-top:-5px;
      visibility:hidden;
      display:none;
  }

image
image[^]
anyone tell me please