function init(){
	var id_ary = Array( "menu_info", "menu_membership", "menu_service", "menu_users_voice", "menu_column", "menu_jinet" );
	var imgObj_ary = Array();
	for( var cnt=0; id_ary.length>cnt; cnt++ ){
		imgObj_ary[cnt] = new Image();
		imgObj_ary[cnt].src = "/images/common/"+id_ary[cnt]+"_on.png";
	}
}

function onButtton( aID ) {
	$("#"+aID).attr("src","/images/common/"+aID+"_on.png");
}

function offButtton( aID ) {
	$("#"+aID).attr("src","/images/common/"+aID+".png");
}

init();