img=new Array(3);
img[0]="<a href='products/index.html'><img border='0' src='img/top_page3.jpg'></a>";
img[1]="<a href='csr/index.html'><img border='0' src='img/top_page4.jpg'></a>";
img[2]="<a href='about/recruit/university/index.html'><img border='0' src='img/top_page6.jpg'></a>";
imgNo=Math.floor(3*Math.random());
document.write(img[imgNo]);