menuid=1;
function changeclassname(id, classname) {
	var o=document.getElementById(id);
	if (o.className!=classname) o.className=classname;
}

function menumouseover(id) {

	for (var i=1;i<7;i++) {
		if (i==menuid || i==id)
			changeclassname("menu"+i, "menu"+i+"_2");
		else
			changeclassname("menu"+i, "menu"+i+"_1");
	}
}

function menumouseout(id) {
	for (var i=1;i<7;i++) {
		if (i==menuid)
			changeclassname("menu"+i, "menu"+i+"_2");
		else
			changeclassname("menu"+i, "menu"+i+"_1");
	}
}

function menuclick(id) {
	var menuurls=new Array();
	menuurls[1]="dj_main.htm";
	menuurls[2]="dj_wenhua.htm";
	menuurls[3]="dj_shehui.htm";
	menuurls[4]="dj_jiaoliu.htm";
	menuurls[5]="dj_zgyfs1.htm";
	menuurls[6]="dj_zgyfs2.htm";
	menuurls[7]="http://app2.cri.cn/netradio/japanese/content.php";
	menuid=id;
	menumouseout(id);
	document.getElementById("main").src=menuurls[id];
}