var mainMenu = 'main-menu';

function extractPageName(hrefString) {
	var arr = hrefString.split('/');
	var result=(arr.length<3) ? hrefString : arr[3].toLowerCase();
	if (result === 'search' || result === 'water' || result === 'heihe' || result === 'glacier' || result === 'yrnmr' || result === 'hiwater')
		result='data';
	if (result === 'admin' && arr.length>=4) result+="/"+arr[4];
		return result;
}
	
function setActiveMenu(arr, crtPage) {
	for (var i=0; i<arr.length; i++)
	{
		if(extractPageName(arr[i].href) === crtPage)
		{
			arr[i].parentNode.className = "active";
			break;
		}
	}
}

function setPage() {
	var hrefString = document.location.href ? document.location.href : document.location;
	if (document.getElementById(mainMenu) !== null)
		setActiveMenu(document.getElementById(mainMenu).getElementsByTagName("a"), extractPageName(hrefString));
}