function mainnav(){

	var msec = (new Date()).getTime();

	new Ajax.Request("include/nav.csv", {
		method: "get",
		parameters: "cache="+msec,
		onSuccess:function(httpObj){
			var text = httpObj.responseText;
			var LF = String.fromCharCode(10);
			var tabText = text.split(LF);
			
			var sel = "<h2><span>メインコンテンツ目次</span></h2>";
			sel +="<ul class='parents'>";
			
			for (var i=0; i<tabText.length-1; i++){
				var cText = tabText[i].split(",");
				
				sel += "<li class='contents0"+i+"'><a href='"+cText[0]+"' title='" + cText[1] + "'";
				
				if (cText[2]=='b') {
					sel += "Target='_blank'";
				}
				
				sel += "><span>"+ cText[1] + "</span></a></li>";
				
			}
			sel +="</ul>";
			
			$("main-nav").innerHTML = sel;
			//$("main-nav").innerHTML = tabText.length;
			
		},
		onFailure:function(httpObj){
			$("main-nav").innerHTML = "エラーで読み込めませんでした";
		}
	});

}