#lava {
		/* you must set it to relative, so that you can use absolute position for children elements */
		position:relative; 
		width:990px; 

	}
	
	#lava ul {
		/* remove the list style and spaces*/
		margin:auto; 
		padding:0; 
		list-style:none; 
		display:inline;
				
		/* position absolute so that z-index can be defined */
		position:absolute; 
		
		/* center the menu, depend on the width of you menu*/
	
		
		
		/* should be higher than #box */
		z-index:100;

	}
	
	#lava ul li {
		
		/* give some spaces between the list items */
		margin:0 6px; 
		
		padding: 18px 0px 0px 10px;
		
		/* display the list item in single row */
		float:left;
	}
	
	#lava #box {
		
		/* position absolute so that z-index can be defined and able to move this item using javascript */
		position:absolute; 

		/* should be lower than the list menu */
		z-index:50; 

		/* image of the right rounded corner */
		background:url(../images/tail.gif) no-repeat right; 
		height:49px;
		
		/* add padding 8px so that the tail would appear */
		padding-right:8px;
		
		/* self-adjust negative margin to make sure the box display in the center of the item */
		margin-left:-10px;
	}
	
	#lava #box .head {
	/* image of the left rounded corner */
		background:url(../images/head.gif) no-repeat 0 0;
	height:49px;
	padding-left:30px;
	}
	
	
	#container {
	margin:auto;
	width: 990px;
	}