Lava lamp menu in jquery

CODICE HTML

CODICE CSS

body {
font-family:georgia;
font-size:14px;
}
a {
text-decoration:none;
color:#333;
}

#lava {
/* you must set it to relative, so that you can use absolute position for children elements */
position:relative;
text-align:center;
width:583px;
height:40px;
}

#lava ul {
/* remove the list style and spaces*/
margin:0;
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*/
left:110px;
top:0;

/* should be higher than #box */
z-index:100;

}

#lava ul li {

/* give some spaces between the list items */
margin:0 15px;

/* 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;
left:0;
top:0;

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

/* image of the right rounded corner */
background:#ccc;
height:20px;

/* 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:#eee;
height:20px;

/* self-adjust left padding to make sure the box display in the center of the item */
padding-left:10px;
}

CODICE JAVASCRIPT

$(document).ready(function () {

//transitions
//for more transition, goto http://gsgd.co.uk/sandbox/jquery/easing/
var style = ‘easeOutElastic’;

//Retrieve the selected item position and width
var default_left = Math.round($(‘#lava li.selected’).offset().left – $(‘#lava’).offset().left);
var default_width = $(‘#lava li.selected’).width();

//Set the floating bar position and width
$(‘#box’).css({left: default_left});
$(‘#box .head’).css({width: default_width});

//if mouseover the menu item
$(‘#lava li’).hover(function () {

//Get the position and width of the menu item
left = Math.round($(this).offset().left – $(‘#lava’).offset().left);
width = $(this).width();

//Set the floating bar position, width and transition
$(‘#box’).stop(false, true).animate({left: left},{duration:1000, easing: style});
$(‘#box .head’).stop(false, true).animate({width:width},{duration:1000, easing: style});

//if user click on the menu
}).click(function () {

//reset the selected item
$(‘#lava li’).removeClass(‘selected’);

//select the current item
$(this).addClass(‘selected’);

});

//If the mouse leave the menu, reset the floating bar to the selected item
$(‘#lava’).mouseleave(function () {

//Retrieve the selected item position and width
default_left = Math.round($(‘#lava li.selected’).offset().left – $(‘#lava’).offset().left);
default_width = $(‘#lava li.selected’).width();

//Set the floating bar position, width and transition
$(‘#box’).stop(false, true).animate({left: default_left},{duration:1500, easing: style});
$(‘#box .head’).stop(false, true).animate({width:default_width},{duration:1500, easing: style});

});

});