function showMenu(nr) {
	var my_elem=document.getElementById("ul_nav");
	var element=document.getElementById("li_"+nr);
	var ul_elem=document.getElementById("ul_"+nr);
	var navi_drop_elem=document.getElementById("navi_drop");
	var winWidth;
	if (element && ul_elem) 
	{
		if (navi_drop_elem.offsetLeft<-10) {
			navi_drop_elem.style.left=0;
			navi_drop_elem.style.marginLeft=0;
		}	
		else {
			winWidth=window.innerWidth;
			if (winWidth!='undefined') winWidth=document.body.clientWidth;
			if (winWidth>959) {
				navi_drop_elem.style.left="50%";
				navi_drop_elem.style.marginLeft="-450px";}
		}
		element.className+=" over";
		ul_elem.style.display="block";
		ul_elem.style.left=element.offsetLeft+"px";
		if (my_elem) my_elem.className+=" hidecurrent";
	}
}

function hideMenu(nr) {
	var my_elem=document.getElementById("ul_nav");
	var element=document.getElementById("li_"+nr);
	var ul_elem=document.getElementById("ul_"+nr);
	if (element && ul_elem) 
	{	
		element.className=element.className.replace("over", "");
		ul_elem.style.display="none";
		if (my_elem) my_elem.className=my_elem.className.replace("hidecurrent", "");
	}
}