var ua = navigator.userAgent.toLowerCase();
isIE = ((ua.indexOf("msie") != -1) && (ua.indexOf("opera") == -1)); 

openMenu=true;
size=0;
sizeMenu=0;
speed=0;
function clickMenu()
{
	speed=20;
	clickMenuAnimation();
}

function clickMenuAnimation()
{
	if(openMenu)
	{
		
		document.getElementById('menu-items').style.height=size+'px';
		if(isIE)
		{
			document.getElementById('menu-container').style.height=sizeMenu+'px';
		}
		if(size>45)
		{
			size-=speed;
			sizeMenu-=speed;
			speed = Math.max(2, speed-1);
			setTimeout('clickMenuAnimation()', 50);
		}
		else
		{
			openMenu=0;
			document.getElementById('menu-link').innerHTML='rozwiń';
		}
	}
	else
	{
		document.getElementById('menu-items').style.height=size+'px';
		if(isIE)
		{
			document.getElementById('menu-container').style.height=sizeMenu+'px';
		}
		if(size<document.getElementById('menu-items').scrollHeight)
		{
			size+=speed;
			sizeMenu+=speed;
			speed = Math.max(2, speed-1);
			setTimeout('clickMenuAnimation()', 50);
		}
		else
		{
			openMenu=1;
			document.getElementById('menu-link').innerHTML='zwiń';
		}
	}
}