// Menu Drop Down Acessível
// Alexandre Junqueira
// contato@alexandrejunqueira.com
// http://www.alexandrejunqueira.com/projetos/menu-drop-down-acessivel/ 
var dropdown_intervalId;
var dropdown_ulId = (!dropdown_ulId) ? 'nav' : dropdown_ulId;
var dropdown_delay = (!dropdown_delay) ? 0 : dropdown_delay;

function dropdown_init()
{
	try
	{
		var as = document.getElementById(dropdown_ulId).getElementsByTagName('a');
		
		for (var a = 0; a < as.length; a++)
		{
			as[a].onfocus = function() { dropdown_expand(this) }
			as[a].onmouseover = function() { dropdown_expand(this) }
			as[a].onblur = function() { dropdown_colapse(dropdown_delay) } 
			as[a].onmouseout = function() { dropdown_colapse(dropdown_delay) }
		}
		
		dropdown_colapse(0);
	
	} catch(e){}
}

function dropdown_expand(caller)
{	
	try
	{	
		clearInterval(dropdown_intervalId);
		
		var uls = caller.parentNode.parentNode.getElementsByTagName('ul');
		
		for (var ul = 0; ul < uls.length; ul++)
			uls[ul].style.left = "-1000em";
		
		caller.parentNode.getElementsByTagName('ul')[0].style.left = "auto";
		
	} catch(e){}	
}

function dropdown_colapse(milliseconds)
{
	try
	{
		clearInterval(dropdown_intervalId);
		
		dropdown_intervalId = setInterval(function()
		{				
			var uls = document.getElementById(dropdown_ulId).getElementsByTagName('ul');
			
			for (var ul = 0; ul < uls.length; ul++)
				uls[ul].style.left = "-1000em";
				
			clearInterval(dropdown_intervalId);
			
		}, milliseconds, null);
		
	} catch(e){}
}

window.onload = dropdown_init;