var last_shown = 0;

function DD_HideIfNotShown(dropdown_id)
{
	var el = document.getElementById('dropdown_'+dropdown_id);
	//alert(el.shown);
	if (el.shown == 0)
	{
		el.style.display='none';
	}
}

function DD_ShowIfHidden(dropdown_id)
{
	var el = document.getElementById('dropdown_'+dropdown_id);
	//alert(el.shown);
	if (el.shown == 1)
	{
		el.style.display='block';
	}
}

function DD_ShowDrop(dropdown_id)
{
	var el = document.getElementById('dropdown_'+dropdown_id);
	el.shown = 1;
	setTimeout("DD_ShowIfHidden('"+dropdown_id+"')", 300);
}

function DD_HideDrop(dropdown_id)
{
	var el = document.getElementById('dropdown_'+dropdown_id);
	el.shown = 0;
	setTimeout("DD_HideIfNotShown('"+dropdown_id+"')", 300);
}