// open hidden layer
function mopen(id)
{	
	// cancel close timer
	mcancelclosetime();

	// close old layer
	if(ddmenuitem) 
	{
	    
	    ddmenuitem.style.visibility = 'hidden';
	    
	    //display style/class
	    listItem = document.getElementById(ddmenuitem.id + "li");
	    listItem.className = '';
	    
	    //Set Style
	    anchorItem = document.getElementById(ddmenuitem.id + "Nav");
	    anchorItem.className = 'mainNav';
	}
	
	// get new layer and show it
	ddmenuitem = document.getElementById(id);
	ddmenuitem.style.visibility = 'visible';
	
	//display style/class
	listItem = document.getElementById(ddmenuitem.id + "li");
	listItem.className = 'dropDownNavOver' + ddmenuitem.id;	
	
    anchorItem = document.getElementById(id + "Nav");
    anchorItem.className = 'mainNavOver';
	
}
// close showed layer
function mclose()
{   
	if(ddmenuitem) 
	{
	    ddmenuitem.style.visibility = 'hidden';
	    ddmenuitem.className = '';
	    //display style/class
	    listItem = document.getElementById(ddmenuitem.id + "li");
	    listItem.className = '';
	    
	    anchorItem = document.getElementById(ddmenuitem.id + "Nav");
	    anchorItem.className = 'mainNav';
	}
}

// go close timer
function mclosetime()
{
	closetimer = window.setTimeout(mclose, timeout);
}

// cancel close timer
function mcancelclosetime()
{
	if(closetimer)
	{
		window.clearTimeout(closetimer);
		closetimer = null;
	}
}