var oOldNavButton = null;

function changeActiveStatus(oThis)
{
	var sImg = oThis.firstChild.src;
	sImg = sImg.replace(/[.]jpg$/, '_active.jpg');
	var oImg = new Image();
	oImg.src = sImg;
	oThis.firstChild.src = oImg.src;
}

function setDefaultActive()
{
	var iIndex = 4;
	var mLocation = document.location.href;
	var arrLIs = document.getElementById('navi').firstChild.childNodes;
	var iLength = arrLIs .length;
	var iCnt = 0;
	var oLink, mFolder;
 	
	mLocation = mLocation.split('/');
	mLocation = mLocation[3];

	while(iCnt  < iLength)
	{
		oLink = arrLIs[iCnt].firstChild;
	
		if(oLink.id === mLocation ){
			changeActiveStatus(oLink);
			return;
		}
		iCnt ++;
	}
}