var root;

var naviImageArray = [
	"btn_prof",
	"btn_faml",
	"btn_mesg",
	"btn_intv",
	"btn_hall",	
	"btn_data",
	"btn_evnt",
	"btn_serv",
	"btn_libr"
];


//　ナビゲーション初期化
function setNaviEvent() {
	var imageSrc = document.getElementById("headerImg").getAttribute("src");
	root = imageSrc.slice(0, imageSrc.indexOf("common"));
	for (var i = 0; i < 9; i++ ) {
			var navi = document.getElementById("btn" + i);
			setMouseEvent(navi, i);
	}
}


// マウスイベントのセット
function setMouseEvent(elm, i) {
	elm.onmouseover = function() {
		this.setAttribute("src", root + "images/" + naviImageArray[i] + "_on.gif");
	};
	
	elm.onmouseout = function() {
		this.setAttribute("src", root + "images/" + naviImageArray[i] + ".gif");
	};
}