var arrowimages={down:['downarrowclass', '/js/down.gif', 23], right:['rightarrowclass', 'js/right.gif']}

    function getRealLeft(el){
    	var L=0;
    	var tempEl = document.getElementById(el);
        if ( document.getElementById(el).offsetLeft == 0 ) {
    	while(tempEl.parentNode){
    		L+= ( tempEl .offsetLeft)? tempEl .offsetLeft: 0;
    		if(tempEl == document.body) break;
    		tempEl = tempEl .parentNode;
    	}
        } else {
          L = document.getElementById(el).offsetLeft;
        }
    	return L;
    }

var jqueryslidemenu={

animateduration: {over: 50, out: 50}, //duration of slide in/ out animation, in milliseconds

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={left:this.left, 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.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 // 0 bij eerste menu
//
//alert(this._offsets.left);
					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) { //if 1 or less queued animations

                           if ( this.istopheader ) {
                               var positionleft = this.offsetLeft - getRealLeft("myslidemenu");
                               var menuwidth = 990 - positionleft;
                               var ulpadding = 197 - this._dimensions.subulh;
                               var leftwidth = this._dimensions.w;
                               $targetul.css({left:"-"+positionleft+"px"}).slideDown(jqueryslidemenu.animateduration.over);
                           } else {
                               $targetul.css({left:menuleft+"px", width:this._dimensions.subulw+'px'}).slideDown(jqueryslidemenu.animateduration.over);
                           }
                        }
				},
				function(e){
					var $targetul=$(this).children("ul:eq(0)")
				  	$targetul.slideUp(jqueryslidemenu.animateduration.out)
				}

			) //end hover
		}) //end $headers.each()
		$mainmenu.find("ul").css({display:'none', visibility:'visible'})
	}) //end document.ready
}
}

//build menu with ID="myslidemenu" on page:
jqueryslidemenu.buildmenu("myslidemenu", arrowimages)