function menu(target){
	cNames = new Array('会社概要','制作実績','プロダクト','採用情報','お問合せ');
	cURLs = new Array('profile.html','portfolio_system.html','product.html','recruit_system.html','mail_regist.html');
	cIcons = new Array('menu_icon_profile.gif','menu_icon_portfolio.gif','menu_icon_product.gif','menu_icon_recruit.gif','menu_icon_mail.gif');
	cIconOns = new Array('menu_icon_profile_on.gif','menu_icon_portfolio_on.gif','menu_icon_product_on.gif','menu_icon_recruit_on.gif','menu_icon_mail_on.gif');
	cIconOvers = new Array('menu_icon_profile_over.gif','menu_icon_portfolio_over.gif','menu_icon_product_over.gif','menu_icon_recruit_over.gif','menu_icon_mail_over.gif');

	for(i=0; i<cNames.length; i++){
		if(target==cNames[i]){
			document.write("<img src='images/"+cIconOns[i]+"' border='0' alt='"+cNames[i]+"' title='"+cNames[i]+"'>");
		}else{
			document.write("<a href='"+cURLs[i]+"'><img src='images/"+cIcons[i]+"' border='0' alt='"+cNames[i]+"' title='"+cNames[i]+"' onMouseOver=this.src='images/"+cIconOvers[i]+"' onMouseOut=this.src='images/"+cIcons[i]+"'></a>");
		}
	}
}