var arrowimages={down:['downarrowclass', '/res/img/down.gif', 20], right:['rightarrowclass', '/res/img/right.gif']}
var slidemenu={
animateduration: {over: 400, out: 150}, 
buildmenu:function(menuid, arrowsvar){
	jQuery(document).ready(function($){
		var $mainmenu=$("#"+menuid+">ul")
		var $headers=$mainmenu.find("ul").parent()
		$headers.each(function(i){
			var $curobj=$(this)
			var $subul=$(this).find('ul:eq(0)')
			this._dimensions={w:this.offsetWidth, h:this.offsetHeight, subulw:$subul.outerWidth(), subulh:$subul.outerHeight()}
			this.istopheader=$curobj.parents("ul").length==1? true : false
			$subul.css({top:this.istopheader? this._dimensions.h+"px" : 0})
			$curobj.children("a:eq(0)").css(this.istopheader? {paddingRight: arrowsvar.down[2]} : {}).append(
				'<img src="'+ (this.istopheader? arrowsvar.down[1] : arrowsvar.right[1])
				+'" class="' + (this.istopheader? arrowsvar.down[0] : arrowsvar.right[0])
				+ '" style="border:0;" />'
			)
			$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? 0 : this._dimensions.w
					menuleft=(this._offsets.left+menuleft+this._dimensions.subulw>$(window).width())? (this.istopheader? -this._dimensions.subulw+this._dimensions.w : -this._dimensions.w) : menuleft
					if ($targetul.queue().length<=1) 
						$targetul.css({left:menuleft+"px", width:this._dimensions.subulw+'px'}).slideDown(slidemenu.animateduration.over)
				},
				function(e){
					var $targetul=$(this).children("ul:eq(0)")
					$targetul.slideUp(slidemenu.animateduration.out)
				}
			) 
			$curobj.click(function(){
				$(this).children("ul:eq(0)").hide()
			})
		}) 
		$mainmenu.find("ul").css({display:'none', visibility:'visible'})
	}) 
}
}
slidemenu.buildmenu("mainnavi", arrowimages)