partners_open = new Image(); partners_open.src   = 'http://phatvuong.com/hopeww/partners_open.jpg';
partners_close = new Image(); partners_close.src = 'http://phatvuong.com/hopeww/partners_close.jpg';

function hideLevel( _levelId, _imgId ) 
{
	var thisLevel = document.getElementById( _levelId );
	var thisImg = document.getElementById( _imgId );
	thisLevel.style.display = "none";
	thisImg.src = partners_open.src;
}

function showLevel( _levelId, _imgId ) 
{
	var thisLevel = document.getElementById( _levelId );
	var thisImg = document.getElementById( _imgId );

	if ( thisLevel.style.display == "none") {
		thisLevel.style.display = "inline";
		thisImg.src = partners_close.src;
	}
	else {
		hideLevel( _levelId, _imgId);
	}
}