function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	} else {
		window.onload = function() {
			if (oldonload) {
				oldonload();
			}
			func();
		}
	}
}

function currentSection () {
	if (document.getElementsByTagName) {
		if (document.getElementsByTagName('a')) {
			var links = document.getElementsByTagName('a');
			for (var i = 0; i < links.length; i++) {
				if (links[i].className == "active") {
					links[i].parentNode.className = "active";
				}
			}
		}
	}
}

addLoadEvent(currentSection);