var timerlen = 5;
var slideAniLen = 500;

var timerID = new Array();
var startTime = new Array();
var obj = new Array();
var endHeight = new Array();
var moving = new Array();
var dir = new Array();

function slidedown(objname){
	if(moving[objname])
		return;

	if(document.getElementById(objname).style.display != "none")
		return; // cannot slide down something that is already visible

	moving[objname] = true;
	dir[objname] = "down";
	startslide(objname);
}

function slideup(objname){
	if(moving[objname])
		return;

	if(document.getElementById(objname).style.display == "none")
		return; // cannot slide up something that is already hidden

	moving[objname] = true;
	dir[objname] = "up";
	startslide(objname);
}

function startslide(objname){
	obj[objname] = document.getElementById(objname);

	endHeight[objname] = parseInt(obj[objname].style.height);
	startTime[objname] = (new Date()).getTime();

	if(dir[objname] == "down"){
		obj[objname].style.height = "1px";
	}

	obj[objname].style.display = "block";

	timerID[objname] = setInterval('slidetick(\'' + objname + '\');',timerlen);
}

function slidetick(objname){
	var elapsed = (new Date()).getTime() - startTime[objname];

	if (elapsed > slideAniLen) {
		endSlide(objname)
	} else {
		var d = Math.round(elapsed / slideAniLen * endHeight[objname]);

		if(dir[objname] == "up")
			d = endHeight[objname] - d;

		obj[objname].style.height = d + "px";
			obj[objname].style.filter = "alpha(opacity='50')";
	}

	return;
}

function endSlide(objname){
	clearInterval(timerID[objname]);

	if(dir[objname] == "up")
		obj[objname].style.display = "none";

	obj[objname].style.height = endHeight[objname] + "px";

	delete(moving[objname]);
	delete(timerID[objname]);
	delete(startTime[objname]);
	delete(endHeight[objname]);
	delete(obj[objname]);
	delete(dir[objname]);

	if (objname == 'gaz') {
		slidedown('zil');
		fadein('zil');
	}

	if (objname == 'zil') {
		slidedown('azlk');
		fadein('azlk');
	}

	if (objname == 'azlk') {
		slidedown('szd');
		fadein('szd');
	}

	if (objname == 'szd') {
		slidedown('lada');
		fadein('lada');
	}

	if (objname == 'lada') {
		slidedown('zaz');
		fadein('zaz');
	}

	if (objname == 'zaz') {
		slidedown('rattad');
		fadein('rattad');
	}

	if (objname == 'rattad') {
		slidedown('tsikklid');
		fadein('tsikklid');
	}

	return;
}