var nav_curr_tr = nav_default_tr;
var nav_active = 0;

function nav_focus_tr(id)
{
	if(nav_curr_tr == id)
	{
		return false;
	}
	nav_blur_tr(nav_curr_tr);
	var tr1 = document.getElementById("nav_tr1_"+id);
	var tr2 = document.getElementById("nav_tr2_"+id);
	tr1.style.display = 'none';
	tr2.style.display = '';
	nav_curr_tr = id;
}

function nav_blur_tr(id)
{
	if( (id == 0) )
	{
		return false;
	}
	var tr1 = fiOb("nav_tr1_"+id);
	var tr2 = document.getElementById("nav_tr2_"+id);
	tr1.style.display = '';
	tr2.style.display = 'none';
	nav_curr_tr = 0;
}

function nav_blur()
{
	window.clearTimeout(nav_active);
	if(nav_default_tr > 0)
	{
		nav_active = window.setTimeout("nav_focus_tr(" + nav_default_tr + ")", 1000);
	}
	nav_blur_tr(nav_curr_tr);
}

function nav_exit()
{
	window.clearTimeout(nav_active);	
}

function nav_enter(id)
{
    if(nav_active)
    {
	   window.clearTimeout(nav_active);	
    }
	nav_active = window.setTimeout("nav_focus_tr(" + id + ")", 0);
}