var navigation;
var navfree = false;

function init()
{
	navigation = document.getElementById("navigation");
	window.onscroll = scrollnavigation;
	scrollnavigation();
}
function scrollnavigation()
{
	var ypos;
	if (window.pageYOffset)
	{
		ypos = window.pageYOffset;
	}
	else if (document.body.scrollTop) 
	{
    	ypos = document.body.scrollTop;
    }
    else if (document.documentElement.scrollTop)
    {
    	ypos = document.documentElement.scrollTop;
    }
    else ypos = 123;
    if (navfree)
    {
		if (ypos <= 150)//149
		{
			navfree = false;
			navigation.style.position = "static";
			navigation.style.top = "auto";
		}
	}	    
	else if (!navfree)
	{		
		if (ypos >= 150)//149
		{	
			navfree = true;
			navigation.style.position = "fixed";
			navigation.style.top = "0px";//1px
		}
	}
}

function menuOver(pref)
{
	var button = document.getElementById(pref + "Button");
	var menu = document.getElementById(pref + "Menu");
	button.style.backgroundColor = "#FFCC00";
	menu.style.visibility = "visible";
}

function menuOut(pref)
{
	var button = document.getElementById(pref + "Button");
	var menu = document.getElementById(pref + "Menu");
	button.style.backgroundColor = "";
	menu.style.visibility = "hidden";
}

function langOver(button)
{
	document.getElementById(button).style.opacity = "1.0";
	document.getElementById(button).style.filter = 'progid:DXImageTransform.Microsoft.Alpha(opacity="100")';
}

function langOut(button)
{
	document.getElementById(button).style.opacity = "0.5";
	document.getElementById(button).style.filter = 'progid:DXImageTransform.Microsoft.Alpha(opacity="50")';
}