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This free JavaScript will add dropping animation for menus when users move mouse over a specified link, or they are set to appear through click. The menu also allows you to set the height, along with scrolling feature for for very long list menus.

Label: animated drop down, navigation menu, dropping animation, mouse over, height, scrolling feature, list

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<style type="text/css" name="jkoutlinemenu.css">
/*
     This script downloaded from www.JavaScriptBank.com
     Come to view and download over 2000+ free javascript at www.JavaScriptBank.com
*/
.outlinemenu{
position: absolute; /*leave this alone*/
display: none; /*leave this alone*/
width: 180px; /*default width of menu*/
border: 1px solid black;
overflow-x: hidden;
}

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

.outlinemenu ul li a{
background: white;
font: bold 13px "Lucida Grande", "Trebuchet MS", Verdana, Helvetica, sans-serif;
color: #00014e;
display: block;
width: auto;
padding: 3px 0;
padding-left: 5px;
text-decoration: none;
border-bottom: 1px solid #B5B5B5;
}

.outlinemenu ul li a:visited, .outlinemenu ul li a:active{
color: #00014e;
}

.outlinemenu ul li a:hover{
color: black;
background: #ffffcb;
}

/* Holly Hack for IE \*/
* html .outlinemenu li {height: 1%; }
* html .outlinemenu li a { height: 1%; }
/* End */
</style>

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<script type="text/javascript" src="/javascript/jquery.js"></script>
<script type="text/javascript" name="jkoutlinemenu.js">
/***********************************************
* Animated Outline Menu- by JavaScript Kit (www.javascriptkit.com)
* This notice must stay intact for usage
* Visit JavaScript Kit at http://www.javascriptkit.com/ for full source code
***********************************************/
var jkoutlinemenu={

effectduration: 300, //duration of animation, in milliseconds
outlinemenulabels: [],
outlinemenus: [], //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=$("#outlineiframeshim")
	//alert(this.$shimobj.attr("src"))
},

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

showmenu:function(e, outlinemenu_pos){
	var outlinemenu=this.outlinemenus[outlinemenu_pos]
	var $menu=outlinemenu.$menuobj
	var $menuinner=outlinemenu.$menuinner
	if ($menu.css("display")=="none"){
		this.alignmenu(e, outlinemenu_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, outlinemenu_pos)
	}
	return false
},

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

definemenu:function(anchorid, menuid, revealtype, optwidth, optheight){
	var $=jQuery
	this.outlinemenulabels.push([anchorid, menuid, revealtype, optwidth, optheight])
},

render:function($){
	for (var i=0, labels=this.outlinemenulabels[i]; i<this.outlinemenulabels.length; i++, labels=this.outlinemenulabels[i]){
		this.outlinemenus.push({$anchorobj:$("#"+labels[0]), $menuobj:$("#"+labels[1]), $menuinner:$("#"+labels[1]).children('ul:first-child'), revealtype:labels[2]})
		var outlinemenu=this.outlinemenus[i]	
		outlinemenu.$anchorobj.add(outlinemenu.$menuobj).attr("_outlinemenupos", i+"pos")
		outlinemenu.$menuobj.css(parseInt(labels[3])>10? {width:parseInt(labels[3])+"px"} : {})
		outlinemenu.$menuobj.css(parseInt(labels[4])<outlinemenu.$menuobj.height()? {height:parseInt(labels[4])+"px", overflow:"scroll", overflowX:"hidden"} : {})
		outlinemenu.actualwidth=outlinemenu.$menuobj.outerWidth()
		outlinemenu.actualheight=outlinemenu.$menuobj.outerHeight()
		outlinemenu.offsetx=outlinemenu.$anchorobj.offset().left
		outlinemenu.offsety=outlinemenu.$anchorobj.offset().top
		outlinemenu.anchorwidth=outlinemenu.$anchorobj.outerWidth()
		outlinemenu.anchorheight=outlinemenu.$anchorobj.outerHeight()
		outlinemenu.$menuobj.css("z-index", ++this.zIndexVal).hide()
		outlinemenu.$menuinner.css("visibility", "hidden")
		outlinemenu.$anchorobj.bind(outlinemenu.revealtype=="click"? "click" : "mouseenter", function(e){
				return jkoutlinemenu.showmenu(e, parseInt(this.getAttribute("_outlinemenupos")))
		})
		outlinemenu.$anchorobj.bind("mouseleave", function(e){
				var $menu=jkoutlinemenu.outlinemenus[parseInt(this.getAttribute("_outlinemenupos"))].$menuobj
				if (e.relatedTarget!=$menu.get(0) && $(e.relatedTarget).parents("#"+$menu.get(0).id).length==0){ //check that mouse hasn't moved into menu object
					jkoutlinemenu.hidemenu(e, parseInt(this.getAttribute("_outlinemenupos")))
				}
		})
		outlinemenu.$menuobj.bind("click mouseleave", function(e){
			jkoutlinemenu.hidemenu(e, parseInt(this.getAttribute("_outlinemenupos")))
		})
	} //end for loop
	$(document).bind("click", function(e){
		for (var i=0; i<jkoutlinemenu.outlinemenus.length; i++){
			jkoutlinemenu.hidemenu(e, i)
		}
	}) //end document.click
	$(window).bind("resize", function(){
		for (var i=0; i<jkoutlinemenu.outlinemenus.length; i++){
			var outlinemenu=jkoutlinemenu.outlinemenus[i]	
			outlinemenu.offsetx=outlinemenu.$anchorobj.offset().left
			outlinemenu.offsety=outlinemenu.$anchorobj.offset().top
		}
	})
	jkoutlinemenu.addshim()
}

}

jQuery(document).ready(function($){
	jkoutlinemenu.render($)
})
/*
     This script downloaded from www.JavaScriptBank.com
     Come to view and download over 2000+ free javascript at www.JavaScriptBank.com
*/
</script>

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<a href="#" id="designanchor">Web Design Links</a>

<br /><br />

<div style="text-align:right"><a href="#" id="designanchor2">More web Design Links</a></div>


<!--Define HTML for all animated menus at the very end of the page (ie: right before </body> tag)!-->

<div id="mymenu1" class="outlinemenu">
<ul>
<li><a href="http://www.dynamicdrive.com/">JavaScript Kit</a></li>
<li><a href="http://www.dynamicdrive.com/" >Dynamic Drive</a></li>
<li><a href="http://www.javascriptbank.com/">JavaScript Bank</a></li>
<li><a href="http://www.dynamicdrive.com/style/" >CSS Library</a></li>
<li><a href="http://www.javascriptkit.com/jsref/">JavaScript Reference</a></li>
<li><a href="http://www.javascriptkit.com/domref/">DOM Reference</a></li>
<li><a href="http://www.cssdrive.com">CSS Drive</a></li>
<li><a href="http://www.javascriptbank.com/forum/">JavaScript Forums</a></li>
<li><a href="http://www.javascriptbank.com/service/">JavaScript Services</a></li>
<li><a href="http://www.codingforums.com/" style="border-bottom-width: 0">Coding Forums</a></li>		
</ul>
</div>

<script type="text/javascript">
//jkoutlinemenu.definemenu("anchorid", "menuid", "mouseover|click", optional_width, optional_height)
jkoutlinemenu.definemenu("designanchor", "mymenu1", "mouseover", 180)
</script>


<div id="mymenu2" class="outlinemenu">
<ul>
<li><a href="http://www.dynamicdrive.com/">JavaScript Kit</a></li>
<li><a href="http://www.dynamicdrive.com/">Dynamic Drive</a></li>
<li><a href="http://www.javascriptbank.com/">JavaScript Bank</a></li>
<li><a href="http://www.dynamicdrive.com/style/" >CSS Library</a></li>
<li><a href="http://www.javascriptbank.com/forum/">JavaScript Forums</a></li>
<li><a href="http://www.javascriptbank.com/service/">JavaScript Services</a></li>
<li><a href="http://www.dynamicdrive.com/style/csslibrary/category/C1/">Horizontal CSS Menus</a></li>
<li><a href="http://www.dynamicdrive.com/style/csslibrary/category/C2/">Vertical CSS Menus</a></li>
<li><a href="http://www.dynamicdrive.com/style/csslibrary/category/C4/">Image CSS</a></li>
<li><a href="http://www.dynamicdrive.com/style/csslibrary/category/C6/">Form CSS</a></li>
<li><a href="http://www.dynamicdrive.com/style/csslibrary/category/C5/">DIVs and containers</a></li>
<li><a href="http://www.dynamicdrive.com/style/csslibrary/category/C7/">Links & Buttons</a></li>
<li><a href="http://www.javascriptkit.com/jsref/">JavaScript Reference</a></li>
<li><a href="http://www.javascriptkit.com/domref/">DOM Reference</a></li>
<li><a href="http://www.cssdrive.com">CSS Drive</a></li>
<li><a href="http://www.codingforums.com/" style="border-bottom-width: 0">Coding Forums</a></li>		
</ul>
</div>

<script type="text/javascript">
//jkoutlinemenu.definemenu("anchorid", "menuid", "mouseover|click", optional_width, optional_height)
jkoutlinemenu.definemenu("designanchor2", "mymenu2", "mouseover", 170, 150)
</script>