var check = "clear";
var check2 = "clear";
var tellen = 0;

function show(){
	 document.getElementById('dropdown').style.filter = "alpha(opacity=" + tellen*10 + ")";
	 document.getElementById('dropdown').style.opacity = "0." + tellen;
	 document.getElementById('dropdown').style.visibility = "visible";
	 if (tellen < 9){
		 check2 = "notclear";
		 tellen++;
		 show();
		}else{
		 document.getElementById('dropdown').style.filter = "alpha(opacity=100)";
		 document.getElementById('dropdown').style.opacity = "1";
		 check2 = "clear";
		}
	}

function hide(){
	if (check2 == "clear"){
		document.getElementById('dropdown').style.filter = "alpha(opacity=" + tellen*10 + ")";
		document.getElementById('dropdown').style.opacity = "0." + tellen;
		if (tellen > -1){
			tellen--;
			hide();
		}else{
			document.getElementById('dropdown').style.visibility = "hidden";
		}
	}
}

function dropdown1(nummer){
	var positie1 = 128;
	var positie2 = document.getElementById(nummer).offsetLeft - 1;
	if (nummer == '16'){document.getElementById('dropdown').innerHTML = '<ul type="none"><li onclick="window.location.href=\'vakantiewoning-boeken\'"><a href="vakantiewoning-boeken">vakantiewoning-boeken</a></li></ul>';}	
	document.getElementById('dropdown').style.top = positie1 + 'px';
	document.getElementById('dropdown').style.left = positie2 + 'px';
	check = "notclear";
	show();
}

function dropdown2(){
	if (check == "clear"){
		hide();
	}
}

function dropdown3(){
	check = "clear";
	setTimeout("dropdown2()", 1);
}

function dropdown4(){
	check = "notclear";
	show();
}