var activeMain = '';
var activeSub = '';

function showActiveSub()
{
	if (document.getElementById('nav_main_current') != null) {
		var snav = document.getElementById('nav_main_current').getElementsByTagName('ul');
		var subH = snav[0].offsetHeight;
		var mainPos = document.getElementById("nav_main").offsetTop;
		snav[0].style.top = mainPos - subH + "px";
		
		//activeMain = document.getElementById('nav_main_current').getElementsByTagName('a')[0];
		activeSub = snav[0];
	}
}

function showSub(p_DElement)
{
	var subH = p_DElement[0].offsetHeight;
    var mainPos = document.getElementById("nav_main").offsetTop;
	
    p_DElement[0].style.zIndex = 100;
	p_DElement[0].style.top = mainPos - subH + "px";
	
	if(activeSub != '') activeSub.style.display = "none";
	if(activeMain != '') activeMain.style.backgroundPosition = "left top";
}

function hideSub(p_DElement)
{
	p_DElement[0].style.zIndex = 10;
	p_DElement[0].style.top = "-999px";
	
	if(activeSub != '') activeSub.style.display = "block";
	if(activeMain != '') activeMain.style.backgroundPosition = "left -30px";
}