var ON_OFF = 0;
var MOD = 2;

function checkVietMode()
{
	if(document.getElementById('viet_menu'))
	{
		if ((MOD == 2) && (ON_OFF == 1))
		{
			document.getElementById('viet_menu').innerHTML = "<a href='javascript:switchVietMode();checkVietMode();' class='rednon'>Ti?ng Vi?t</a><font class='itemnorDim'>&nbsp;[F9]</font>";
		}
		else
		{
			document.getElementById('viet_menu').innerHTML = "<a href='javascript:switchVietMode();checkVietMode();' class='rednon'>Ti?ng Anh</a><font class='itemnorDim'>&nbsp;[F9]</font>";
		}
	}
}

selector_id = 'VnModeSelector';
if (document.getElementById(selector_id))
{
	selectVnMode(selector_id);
	document.getElementById(selector_id).onchange = function() { changeVnMode(this.selectedIndex); };

}

function switchVietMode()
{
	if (ON_OFF == 1)
	{
		ON_OFF = 0;
	}
	else
	{
		ON_OFF = 1;
	}
	checkVietMode();
	selectVnMode(selector_id);
}

function selectVnMode(id)
{
	if (document.getElementById(id))
		document.getElementById(id).selectedIndex = (ON_OFF==0) ? 0 : MOD;
}

function changeVnMode(mode)
{
	switch (mode)
	{
		case	0:	ON_OFF = 0; break;
		case	1:
		case	2:
		case	3:	ON_OFF = 1; MOD = mode; break;
	}
}

function switch_display(obj)
{
	if(obj.style.display=='none')
	{
		obj.style.display='';
	}
	else
	{
		obj.style.display='none';
	}
}

function switch_obj(objName)
{
	switch_display(document.getElementById(objName));
}