<!-- menu -->
var image1 = new Image;
image1.src ="/sim_mouse/home.gif";
var image2 = new Image;
image2.src ="/sim_mouse/home_on.gif";

var image3 = new Image;
image3.src ="/sim_mouse/company.gif";
var image4 = new Image;
image4.src ="/sim_mouse/company_on.gif";

var image5 = new Image;
image5.src ="/big5_mouse/manage.gif";
var image6 = new Image;
image6.src ="/big5_mouse/manage_on.gif";

var image7 = new Image;
image7.src ="/sim_mouse/business.gif";
var image8 = new Image;
image8.src ="/sim_mouse/business_on.gif";

var image9 = new Image;
image9.src ="/sim_mouse/bus.gif";
var image10 = new Image;
image10.src ="/sim_mouse/bus_on.gif";

var image11 = new Image;
image11.src ="/sim_mouse/contact.gif";
var image12 = new Image;
image12.src ="/sim_mouse/contact_on.gif";

var image13 = new Image;
image13.src ="/big5_mouse/big5.gif";
var image14 = new Image;
image14.src ="/big5_mouse/big5_on.gif";

var image15 = new Image;
image15.src ="/big5_mouse/eng.gif";
var image16 = new Image;
image16.src ="/big5_mouse/eng_on.gif";
<!-- index title -->

var image21 = new Image;
image21.src ="/sim_mouse/t1.png";
var image22 = new Image;
image22.src ="/sim_mouse/t1_on.png";

var image23 = new Image;
image23.src ="/big5_mouse/t2.png";
var image24 = new Image;
image24.src ="/big5_mouse/t2_on.png";

var image25 = new Image;
image25.src ="/sim_mouse/t3.png";
var image26 = new Image;
image26.src ="/sim_mouse/t3_on.png";

var image27 = new Image;
image27.src ="/sim_mouse/t4.png";
var image28 = new Image;
image28.src ="/sim_mouse/t4_on.png";

var image29 = new Image;
image29.src ="/sim_mouse/t5.png";
var image30 = new Image;
image30.src ="/sim_mouse/t5_on.png";

<!-- business title -->
var image31 = new Image;
image31.src ="/sim_mouse/student.gif";
var image32 = new Image;
image32.src ="/sim_mouse/student_on.gif";

var image33 = new Image;
image33.src ="/sim_mouse/hire.gif";
var image34 = new Image;
image34.src ="/sim_mouse/hire_on.gif";

var image35 = new Image;
image35.src ="/sim_mouse/transfer.gif";
var image36 = new Image;
image36.src ="/sim_mouse/transfer_on.gif";

var image37 = new Image;
image37.src ="/sim_mouse/employees.gif";
var image38 = new Image;
image38.src ="/sim_mouse/employees_on.gif";

var image39 = new Image;
image39.src ="/sim_mouse/contract.gif";
var image40 = new Image;
image40.src ="/sim_mouse/contract_on.gif";