$(document).ready(function(){
	//imgタグに[class="rollover"]で[src="hogehoge_on"]を参照
	$("img.rollover").each(function() {
		var off = this.src;
		var dot = this.src.lastIndexOf('.');
		var on = this.src.substr(0, dot) +
			'_on' + this.src.substr(dot, 4);
		$(this).hover(
			function() { this.src = on; },
			function() { this.src = off; });
	});
	
	var url=document.URL;//urlを取得
	if(url.indexOf("tw") != -1){
		$("#header div").css("backgroundImage","url(../tw/img/header_bg.png)");
	}
	
	$("#net_list .provider_set:first").hide();
	
});