var mymenu={
	arrowimages: {down:[
		'downarrowclass',  // 菜单右侧三角的样式
		url+'menu/down.gif',        // 右侧三角图片的路径
		0                  // 每个菜单项在原有宽度的基础上再增加一定的宽度  
	], right:[
		'rightarrowclass', // 子菜单右侧三角的样式
		url+'menu/right.gif'        // 子菜单右侧三角的路径
	]},
	transition: {overtime:300, outtime:300},
	shadow: {
		enable:false,   // 是否开启阴影效果
		offsetx:2,     // 阴影的距离
		offsety:2
	},
	///////Stop configuring beyond here///////////////////////////
	detectwebkit: navigator.userAgent.toLowerCase().indexOf("applewebkit")!=-1, //detect WebKit browsers (Safari, Chrome etc)
	detectie6: document.all && !window.XMLHttpRequest,
	getajaxmenu:function($, setting){ //function to fetch external page containing the panel DIVs
		var $menucontainer=$('#'+setting.contentsource[0]) //reference empty div on page that will hold menu
		$menucontainer.html("Loading Menu...")
		$.ajax({
			url: setting.contentsource[1], //path to external menu file
			async: true,
			error:function(ajaxrequest){
				$menucontainer.html('Error fetching content. Server Response: '+ajaxrequest.responseText)
			},
			success:function(content){
				$menucontainer.html(content)
				mymenu.buildmenu($, setting)
			}
		})
	},
	buildmenu:function($, setting){
		var smoothmenu=mymenu;
		var $mainmenu=$("#"+setting.mainmenuid+">ul") //reference main menu UL
		$mainmenu.parent().get(0).className=setting.classname || "mymenu"
		var $headers=$mainmenu.find("ul").parent()
		$headers.hover(
			function(e){
				$(this).children('a:eq(0)').addClass('selected')
			},
			function(e){
				$(this).children('a:eq(0)').removeClass('selected')
			}
		)
		$headers.each(function(i){ //loop through each LI header
			var $curobj=$(this).css({zIndex: 100-i}) //reference current LI header
			var $subul=$(this).find('ul:eq(0)').css({display:'block'})
			this._dimensions={w:this.offsetWidth, h:this.offsetHeight, subulw:$subul.outerWidth(), subulh:$subul.outerHeight()}
			this.istopheader=$curobj.parents("ul").length==1? true : false //is top level header?
			$subul.css({top:this.istopheader && setting.orientation!='v'? this._dimensions.h+"px" : 0})
			$curobj.children("a:eq(0)").css(this.istopheader? {paddingRight: smoothmenu.arrowimages.down[2]} : {}).append(
				'<img src="'+ (this.istopheader && setting.orientation!='v'? smoothmenu.arrowimages.down[1] : smoothmenu.arrowimages.right[1])
				+'" class="' + (this.istopheader && setting.orientation!='v'? smoothmenu.arrowimages.down[0] : smoothmenu.arrowimages.right[0])
				+ '" />'
			)
			if (smoothmenu.shadow.enable){
				this._shadowoffset={x:(this.istopheader?$subul.offset().left+smoothmenu.shadow.offsetx : this._dimensions.w), y:(this.istopheader? $subul.offset().top+smoothmenu.shadow.offsety : $curobj.position().top)} //store this shadow's offsets
				if (this.istopheader)
					$parentshadow=$(document.body)
				else{
					var $parentLi=$curobj.parents("li:eq(0)")
					$parentshadow=$parentLi.get(0).$shadow
				}
				this.$shadow=$('<div class="ddshadow'+(this.istopheader? ' toplevelshadow' : '')+'"></div>').prependTo($parentshadow).css({left:this._shadowoffset.x+'px', top:this._shadowoffset.y+'px'})  //insert shadow DIV and set it to parent node for the next shadow div
			}
			$curobj.hover(
				function(e){
					var $targetul=$(this).children("ul:eq(0)")
					this._offsets={left:$(this).offset().left, top:$(this).offset().top}
					var menuleft=this.istopheader && setting.orientation!='v'? 0 : this._dimensions.w
					menuleft=(this._offsets.left+menuleft+this._dimensions.subulw>$(window).width())? (this.istopheader && setting.orientation!='v'? -this._dimensions.subulw+this._dimensions.w : -this._dimensions.w) : menuleft //calculate this sub menu's offsets from its parent
					if ($targetul.queue().length<=1){ //if 1 or less queued animations
						$targetul.css({left:menuleft+"px", width:this._dimensions.subulw+'px'}).animate({height:'show',opacity:'show'}, mymenu.transition.overtime)
						if (smoothmenu.shadow.enable){
							var shadowleft=this.istopheader? $targetul.offset().left+mymenu.shadow.offsetx : menuleft
							var shadowtop=this.istopheader?$targetul.offset().top+smoothmenu.shadow.offsety : this._shadowoffset.y
							if (!this.istopheader && mymenu.detectwebkit){ //in WebKit browsers, restore shadow's opacity to full
								this.$shadow.css({opacity:1})
							}
							this.$shadow.css({overflow:'', width:this._dimensions.subulw+'px', left:shadowleft+'px', top:shadowtop+'px'}).animate({height:this._dimensions.subulh+'px'}, mymenu.transition.overtime)
						}
					}
				},
				function(e){
					var $targetul=$(this).children("ul:eq(0)")
					$targetul.animate({height:'hide', opacity:'hide'}, mymenu.transition.outtime)
					if (smoothmenu.shadow.enable){
						if (mymenu.detectwebkit){ //in WebKit browsers, set first child shadow's opacity to 0, as "overflow:hidden" doesn't work in them
							this.$shadow.children('div:eq(0)').css({opacity:0})
						}
						this.$shadow.css({overflow:'hidden'}).animate({height:0}, mymenu.transition.outtime)
					}
				}
			) //end hover
		}) //end $headers.each()
		$mainmenu.find("ul").css({display:'none', visibility:'visible'})
	},
	init:function(setting){
		if (typeof setting.customtheme=="object" && setting.customtheme.length==2){ //override default menu colors (default/hover) with custom set?
			var mainmenuid='#'+setting.mainmenuid
			var mainselector=(setting.orientation=="v")? mainmenuid : mainmenuid+', '+mainmenuid
			document.write('<style type="text/css">\n'
				+mainselector+' ul li a {background:'+setting.customtheme[0]+';}\n'
				+mainmenuid+' ul li a:hover {background:'+setting.customtheme[1]+';}\n'
			+'</style>')
		}
		jQuery(document).ready(function($){ //ajax menu?
			if (typeof setting.contentsource=="object"){ //if external ajax menu
				mymenu.getajaxmenu($, setting)
			}
			else{ //else if markup menu
				mymenu.buildmenu($, setting)
			}
		})
	}
}