function showHideCategory(searchTxt){
	var topArticle = new Array();
	topArticle = $('#top').find('article');
	var top = $('#top');
	
	var articleMaXNum = $(topArticle).length;
	
	//var i=1; id ="blankTop"以外0番目のarticleは除外
	for(var i = 1; i < articleMaXNum; i++){
		var article_str = $(topArticle).eq(i).attr("class");
		switch(searchTxt){
			case "about":
				if(article_str.match("bg_about") != null){
					$(topArticle).eq(i).removeClass("heightzero");
					$(topArticle).eq(i).show();
				}else{
					$(topArticle).eq(i).addClass("heightzero");
					$(topArticle).eq(i).hide();
				}
				break;
			case "works":
				if(article_str.match("bg_works") != null){
					$(topArticle).eq(i).removeClass("heightzero");
					$(topArticle).eq(i).show();
				}else{
					$(topArticle).eq(i).addClass("heightzero");
					$(topArticle).eq(i).hide();
				}
				break;
			case "service":
				if(article_str.match("bg_service") != null){
					$(topArticle).eq(i).removeClass("heightzero");
					$(topArticle).eq(i).show();
				}else{
						$(topArticle).eq(i).addClass("heightzero");
						$(topArticle).eq(i).hide();
				}
				break;
			case "recruit":
				if(article_str.match("bg_recruit") != null){
					$(topArticle).eq(i).removeClass("heightzero");
					$(topArticle).eq(i).show();
				}else{
					$(topArticle).eq(i).addClass("heightzero");
					$(topArticle).eq(i).hide();
				}
				break;
			default:
					return;
				break;
		}
	}
}