function display_image(){
var iValue,rNumber;

var img1="topimage_1-1.jpg";
var img2="topimage_1-2.jpg";
var img3="topimage_1-3.jpg";
var img4="topimage_1-4.jpg";
var img5="topimage_1-5.jpg";
var img6="topimage_1-6.jpg";
var img7="topimage_1-7.jpg";
var img8="topimage_1-8.jpg";
var img9="topimage_1-9.jpg";

    iValue = Math.random() * 9;
    rNumber = Math.ceil(iValue);
    if(rNumber == 0){rNumber++};
    document.write('<img src=\"pic/' + eval("img" + rNumber) + '\" width=\"360\" height=\"172\" alt=\"OOSU PRESS\" border=\"0\">')
}