function initPage()
{
	var nav = document.getElementById("top-nav");
	if (nav)
	{
		var nodes = nav.getElementsByTagName("li");
		for (var i = 0; i < nodes.length; i++)
		{
			nodes[i].onmouseover = function () 
			{
				if (this.className.indexOf("hover") == -1)
				{
					this.className += " hover";
				}
			}
			nodes[i].onmouseout = function ()
			{
				this.className = this.className.replace(" hover", "");
			}
		}
	}
}
if (window.attachEvent && !window.opera)
	window.attachEvent("onload", initPage);

function showNav(block)
{
	document.getElementById('link1_my').style.display = 'none';
	document.getElementById('link2_your').style.display = 'none';
	document.getElementById('link3_e').style.display = 'none';
	document.getElementById('link4_our').style.display = 'none';
	
	document.getElementById(block).style.display = 'block';	
}

function unshowNav(block)
{
	document.getElementById('link1_my').style.display = 'none';
	document.getElementById('link2_your').style.display = 'none';
	document.getElementById('link3_e').style.display = 'none';
	document.getElementById('link4_our').style.display = 'none';

	if(block == 'profile' || block == 'wall' || block == 'trip' || block == 'group')
	{
		document.getElementById('link1_my').style.display = 'block';
	}
	else 
	{
		if(block == 'guide' || block == 'school' || block == 'place' || block == 'union')
		{
			document.getElementById('link2_your').style.display = 'block';
		}
		else 
		{
			if(block == 'flight' || block == 'hotel' || block == 'special_offers')
			{
				document.getElementById('link3_e').style.display = 'block';
			}
			else 
			{
				if(block == 'our_content')
				{
					document.getElementById('link4_our').style.display = 'block';
				}
			}
		}
	}
}