/** 画像先読み **/
function preloader(file) {
	var xmlhttp = null;
	var loaded = false;
	var preloadImages = new Array();

	if (xmlhttp != null && xmlhttp.readyState != 0 && xmlhttp.readyState != 4) {
		xmlhttp.abort();
	}

	try {
		// Internet Explorer 7, Firefox, Mozilla, Nestcape, Safari
		xmlhttp = new XMLHttpRequest();
	}
	catch(e) {
		try {
			xmlhttp = new ActiveXObject('Microsoft.XMLHTTP');
		}
		catch(e) {
			// Ajax非対応ブラウザ
			xmlhttp = null;
			return false;
		}
	}

	xmlhttp.onreadystatechange = function() {
		if (xmlhttp.readyState == 4){
			if (xmlhttp.status == 200){
				// 画像ロード処理
				var imgcol = xmlhttp.responseXML.getElementsByTagName('image');
				for (var i=0; i<imgcol.length; i++) {
					preloadImages[i] = new Image();
					preloadImages[i].src = imgcol[i].firstChild.nodeValue;
				}

				loaded = true;
			}
			else{
				alert('Failed to get response :'+ xmlhttp.statusText);
			}
		}
	};

	xmlhttp.open('GET', file, true);
	xmlhttp.send(null);
}

/** スマートロールオーバー **/
function smartRollover() {
	if(document.getElementsByTagName) {
		var images = document.getElementsByTagName("img");
		for(var i=0; i < images.length; i++) {
			if(images[i].getAttribute("src").match("_off."))
			{
				images[i].onmouseover = function() {
					this.setAttribute("src", this.getAttribute("src").replace("_off.", "_on."));
				}
				images[i].onmouseout = function() {
					this.setAttribute("src", this.getAttribute("src").replace("_on.", "_off."));
				}
			}
		}
	}
}
if(window.addEventListener) {
	window.addEventListener("load", smartRollover, false);
}
else if(window.attachEvent) {
	window.attachEvent("onload", smartRollover);
}


/** コンテンツ表示・非表示 **/
function disp_toggle(disp_id) {

	with (document.getElementById(disp_id)) className = (className == "hide_tr") ? "show_tr" : "hide_tr";

}


/** セレクトフォームからリンク　**/
function nav() {
	var url = document.churl.seltitle.options[document.churl.seltitle.selectedIndex].value;

	if(url != "" ){
	location.href = url;
	}

}

function nav2() {
	var url = document.churl2.seltitle2.options[document.churl2.seltitle2.selectedIndex].value;

	if(url != "" ){
	location.href = url;
	}

}