var solution_on=new Image();
solution_on.src="img/interface/navi_btn_solution_a.gif";
var solution_off=new Image();
solution_off.src="img/interface/navi_btn_solution.gif";


var lecture_on=new Image();
lecture_on.src="img/interface/navi_btn_lecture_a.gif";
var lecture_off=new Image();
lecture_off.src="img/interface/navi_btn_lecture.gif";


var consul_on=new Image();
consul_on.src="img/interface/navi_btn_consul_a.gif";
var consul_off=new Image();
consul_off.src="img/interface/navi_btn_consul.gif";


var coordinator_on=new Image();
coordinator_on.src="img/interface/navi_btn_coordinator_a.gif";
var coordinator_off=new Image();
coordinator_off.src="img/interface/navi_btn_coordinator.gif";


var info_on=new Image();
info_on.src="img/interface/navi_btn_info_a.gif";
var info_off=new Image();
info_off.src="img/interface/navi_btn_info.gif";