function initialiseNav(navitem){
				//centre of this button
				var widthone = 0;
				widthone = $(navitem).outerWidth();
				widthone = widthone/2;
				
				$(navitem).prevUntil('ul').each(function() {
					widthone = widthone + ($(this).outerWidth());
				});
				
				//width of subnav
				var widthtwo = 0;
				$(navitem).find("li").each(function() {
					widthtwo = widthtwo + ($(this).outerWidth());
				});
				widthtwo = widthtwo/1.2;
				
				//calculate margin
				var marginvalue = 0;
				marginvalue = widthone - widthtwo;
				
				if(marginvalue>0){
					//set left margin of first subnav item only if it isn't negative
					//$(navitem).children("ul").find("li").first().css("margin-left", marginvalue);
				}
			}
		
			function hideAllNav(menu){
				$(".simplenav ul ul").removeClass("on fix");
				$(".simplenav ul ul").addClass("off");
			}
			
			function showChildNav(actOnMe){
				$(".simplenav li").removeClass("MenuVisible");
				$(actOnMe).parent("li").find("ul").removeClass("off");
				$(actOnMe).parent("li").find("ul").addClass("on fix");
				$(actOnMe).parent("li").not($("li.here")).find("ul").bind("mouseenter",function(){
					$(this).parent("li").addClass("MenuVisible");
					
				}).bind("mouseleave",function(){
					$(this).parent("li").removeClass("MenuVisible");
				});
			}
			
			function showCurrentNav(){
				//only do this if it is currently hidden
				if($(".simplenav li.here ul").hasClass("off")){
					$(".simplenav li.here ul").removeClass("off");
					$(".simplenav li.here ul").addClass("on fix");
				}
			}