JQuery Mega Menu

.megamenu{
position: absolute;
display: none;
left: 0;
top: 0;
background: white;
border: 1px solid #f06b24;
border-width: 5px 1px;
padding: 10px;
font: normal 12px Verdana;
z-index: 100;

}

.megamenu .column{
float: left;
width: 180px; /*width of each menu column*/
margin-right: 5px;
}

.megamenu .column ul{
margin: 0;
padding: 0;
list-style-type: none;
}

.megamenu .column ul li{
padding-bottom: 5px;
}

.megamenu .column h3{
background: #e0e0e0;
font: bold 13px Arial;
margin: 0 0 5px 0;
}

.megamenu .column ul li a{
text-decoration: none;
}

.megamenu .column ul li a:hover{
color: red;
}

<script type='text/javascript'>
//<![CDATA[

jQuery.noConflict();

var jkmegamenu={

effectduration: 300, //duration of animation, in milliseconds
delaytimer: 200, //delay after mouseout before menu should be hidden, in milliseconds

//No need to edit beyond here
megamenulabels: [],
megamenus: [], //array to contain each block menu instances
zIndexVal: 1000, //starting z-index value for drop down menu
$shimobj: null,

addshim:function($){
$(document.body).append('<IFRAME id="outlineiframeshim" src="'+(location.protocol=="https:"? 'blank.htm' : 'about:blank')+'" style="display:none; left:0; top:0; z-index:999; position:absolute; filter:progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=0)" frameBorder="0" scrolling="no"></IFRAME>')
this.$shimobj=$("#outlineiframeshim")
},

alignmenu:function($, e, megamenu_pos){
var megamenu=this.megamenus[megamenu_pos]
var $anchor=megamenu.$anchorobj
var $menu=megamenu.$menuobj
var menuleft=($(window).width()-(megamenu.offsetx-$(document).scrollLeft())>megamenu.actualwidth)? megamenu.offsetx : megamenu.offsetx-megamenu.actualwidth+megamenu.anchorwidth //get x coord of menu
//var menutop=($(window).height()-(megamenu.offsety-$(document).scrollTop()+megamenu.anchorheight)>megamenu.actualheight)? megamenu.offsety+megamenu.anchorheight : megamenu.offsety-megamenu.actualheight
var menutop=megamenu.offsety+megamenu.anchorheight //get y coord of menu
$menu.css({left:menuleft+"px", top:menutop+"px"})
this.$shimobj.css({width:megamenu.actualwidth+"px", height:megamenu.actualheight+"px", left:menuleft+"px", top:menutop+"px", display:"block"})
},

showmenu:function(e, megamenu_pos){
var megamenu=this.megamenus[megamenu_pos]
var $menu=megamenu.$menuobj
var $menuinner=megamenu.$menuinner
if ($menu.css("display")=="none"){
this.alignmenu(jQuery, e, megamenu_pos)
$menu.css("z-index", ++this.zIndexVal)
$menu.show(this.effectduration, function(){
$menuinner.css('visibility', 'visible')
})
}
else if ($menu.css("display")=="block" && e.type=="click"){ //if menu is hidden and this is a "click" event (versus "mouseout")
this.hidemenu(e, megamenu_pos)
}
return false
},

hidemenu:function(e, megamenu_pos){
var megamenu=this.megamenus[megamenu_pos]
var $menu=megamenu.$menuobj
var $menuinner=megamenu.$menuinner
$menuinner.css('visibility', 'hidden')
this.$shimobj.css({display:"none", left:0, top:0})
$menu.hide(this.effectduration)
},

definemenu:function(anchorid, menuid, revealtype){
this.megamenulabels.push([anchorid, menuid, revealtype])
},

render:function($){
for (var i=0, labels=this.megamenulabels[i]; i<this.megamenulabels.length; i++, labels=this.megamenulabels[i]){
if ($('#'+labels[0]).length!=1 || $('#'+labels[1]).length!=1) //if one of the two elements are NOT defined, exist
return
this.megamenus.push({$anchorobj:$("#"+labels[0]), $menuobj:$("#"+labels[1]), $menuinner:$("#"+labels[1]).children('ul:first-child'), revealtype:labels[2], hidetimer:null})
var megamenu=this.megamenus[i]
megamenu.$anchorobj.add(megamenu.$menuobj).attr("_megamenupos", i+"pos") //remember index of this drop down menu
megamenu.actualwidth=megamenu.$menuobj.outerWidth()
megamenu.actualheight=megamenu.$menuobj.outerHeight()
megamenu.offsetx=megamenu.$anchorobj.offset().left
megamenu.offsety=megamenu.$anchorobj.offset().top
megamenu.anchorwidth=megamenu.$anchorobj.outerWidth()
megamenu.anchorheight=megamenu.$anchorobj.outerHeight()
$(document.body).append(megamenu.$menuobj) //move drop down menu to end of document
megamenu.$menuobj.css("z-index", ++this.zIndexVal).hide()
megamenu.$menuinner.css("visibility", "hidden")
megamenu.$anchorobj.bind(megamenu.revealtype=="click"? "click" : "mouseenter", function(e){
var menuinfo=jkmegamenu.megamenus[parseInt(this.getAttribute("_megamenupos"))]
clearTimeout(menuinfo.hidetimer) //cancel hide menu timer
return jkmegamenu.showmenu(e, parseInt(this.getAttribute("_megamenupos")))
})
megamenu.$anchorobj.bind("mouseleave", function(e){
var menuinfo=jkmegamenu.megamenus[parseInt(this.getAttribute("_megamenupos"))]
if (e.relatedTarget!=menuinfo.$menuobj.get(0) && $(e.relatedTarget).parents("#"+menuinfo.$menuobj.get(0).id).length==0){ //check that mouse hasn't moved into menu object
menuinfo.hidetimer=setTimeout(function(){ //add delay before hiding menu
jkmegamenu.hidemenu(e, parseInt(menuinfo.$menuobj.get(0).getAttribute("_megamenupos")))
}, jkmegamenu.delaytimer)
}
})
megamenu.$menuobj.bind("mouseenter", function(e){
var menuinfo=jkmegamenu.megamenus[parseInt(this.getAttribute("_megamenupos"))]
clearTimeout(menuinfo.hidetimer) //cancel hide menu timer
})
megamenu.$menuobj.bind("click mouseleave", function(e){
var menuinfo=jkmegamenu.megamenus[parseInt(this.getAttribute("_megamenupos"))]
menuinfo.hidetimer=setTimeout(function(){ //add delay before hiding menu
jkmegamenu.hidemenu(e, parseInt(menuinfo.$menuobj.get(0).getAttribute("_megamenupos")))
}, jkmegamenu.delaytimer)
})
} //end for loop
if(/Safari/i.test(navigator.userAgent)){ //if Safari
$(window).bind("resize load", function(){
for (var i=0; i<jkmegamenu.megamenus.length; i++){
var megamenu=jkmegamenu.megamenus[i]
var $anchorisimg=(megamenu.$anchorobj.children().length==1 && megamenu.$anchorobj.children().eq(0).is('img'))? megamenu.$anchorobj.children().eq(0) : null
if ($anchorisimg){ //if anchor is an image link, get offsets and dimensions of image itself, instead of parent A
megamenu.offsetx=$anchorisimg.offset().left
megamenu.offsety=$anchorisimg.offset().top
megamenu.anchorwidth=$anchorisimg.width()
megamenu.anchorheight=$anchorisimg.height()
}
}
})
}
else{
$(window).bind("resize", function(){
for (var i=0; i<jkmegamenu.megamenus.length; i++){
var megamenu=jkmegamenu.megamenus[i]
megamenu.offsetx=megamenu.$anchorobj.offset().left
megamenu.offsety=megamenu.$anchorobj.offset().top
}
})
}
jkmegamenu.addshim($)
}

}

jQuery(document).ready(function($){
jkmegamenu.render($)
})
//]]></script>

<!--Mega Menu Anchor-->
<a href="http://www.javascriptkit.com" id="megaanchor"><img src="http://i291.photobucket.com/albums/ll311/caprt3a/anchor.gif" style="border-width:0" /></a>

<!--Mega Drop Down Menu HTML. Retain given CSS classes-->
<div id="megamenu1" class="megamenu">

<div class="column">
<h3>Web Development</h3>
<ul>
<li><a href="http://www.javascriptkit.com">JavaScript Kit</a></li>
<li><a href="http://www.dynamicdrive.com/">Dynamic Drive</a></li>
<li><a href="http://www.cssdrive.com">CSS Drive</a></li>
<li><a href="http://www.codingforums.com">Coding Forums</a></li>
<li><a href="http://www.javascriptkit.com/domref/">DOM Reference</a></li>
</ul>
</div>

<div class="column">
<h3>News Related</h3>
<ul>
<li><a href="http://www.cnn.com/">CNN</a></li>
<li><a href="http://www.msnbc.com">MSNBC</a></li>
<li><a href="http://www.google.com">Google</a></li>
<li><a href="http://news.bbc.co.uk">BBC News</a></li>
</ul>
</div>

<div class="column">
<h3>Technology</h3>
<ul>
<li><a href="http://www.news.com/">News.com</a></li>
<li><a href="http://www.slashdot.com">SlashDot</a></li>
<li><a href="http://www.digg.com">Digg</a></li>
<li><a href="http://www.techcrunch.com">Tech Crunch</a></li>
</ul>
</div>

<br style="clear: left" /> <!--Break after 3rd column. Move this if desired-->

<div class="column">
<h3>Web Development</h3>
<ul>
<li><a href="http://www.javascriptkit.com">JavaScript Kit</a></li>
<li><a href="http://www.dynamicdrive.com/">Dynamic Drive</a></li>
<li><a href="http://www.cssdrive.com">CSS Drive</a></li>
<li><a href="http://www.codingforums.com">Coding Forums</a></li>
<li><a href="http://www.javascriptkit.com/domref/">DOM Reference</a></li>
</ul>
</div>

<div class="column">
<h3>News Related</h3>
<ul>
<li><a href="http://www.cnn.com/">CNN</a></li>
<li><a href="http://www.msnbc.com">MSNBC</a></li>
<li><a href="http://www.google.com">Google</a></li>
<li><a href="http://news.bbc.co.uk">BBC News</a></li>
</ul>
</div>

<div class="column">
<h3>Technology</h3>
<ul>
<li><a href="http://www.news.com/">News.com</a></li>
<li><a href="http://www.slashdot.com">SlashDot</a></li>
<li><a href="http://www.digg.com">Digg</a></li>
<li><a href="http://www.techcrunch.com">Tech Crunch</a></li>
</ul>
</div>
</div>
<script type="text/javascript">
//jkmegamenu.definemenu("anchorid", "menuid", "mouseover|click")
jkmegamenu.definemenu("megaanchor", "megamenu1", "mouseover")
</script>