window.onload = function(){
	
	var fileUrl = location.href;
	
	navId = new Array;
	navId[0] = document.getElementById("nav1");
	navId[1] = document.getElementById("nav2");
	navId[2] = document.getElementById("nav3");
	navId[3] = document.getElementById("nav4");
	navId[4] = document.getElementById("nav5");
	
	navHref = new Array;
	navHref[0] = navId[0].getAttribute("href");
	navHref[1] = navId[1].getAttribute("href");
	navHref[2] = navId[2].getAttribute("href");
	navHref[3] = navId[3].getAttribute("href");
	navHref[4] = navId[4].getAttribute("href");
	
	navImg = new Array;
	navImg[0] = navId[0].firstChild;
	navImg[1] = navId[1].firstChild;
	navImg[2] = navId[2].firstChild;
	navImg[3] = navId[3].firstChild;
	navImg[4] = navId[4].firstChild;
	
	if(fileUrl.match(/news/)){
		navImg[0].setAttribute("src", navImg[0].getAttribute("src").replace("_off.", "_on."));
	}else if(fileUrl.match(/philosophy/)){
		navImg[1].setAttribute("src", navImg[1].getAttribute("src").replace("_off.", "_on."));
	}else if(fileUrl.match(/csr/)){
		navImg[2].setAttribute("src", navImg[2].getAttribute("src").replace("_off.", "_on."));
	}else if(fileUrl.match(/business/)){
		navImg[3].setAttribute("src", navImg[3].getAttribute("src").replace("_off.", "_on."));
	}else if(fileUrl.match(/company/)){
		navImg[4].setAttribute("src", navImg[4].getAttribute("src").replace("_off.", "_on."));
	}

}