var ranimg = new Array();
ranimg[0]="top_keyvis01.jpg";
ranimg[1]="top_keyvis02.jpg";
ranimg[2]="top_keyvis03.jpg";
ranimg[3]="top_keyvis04.jpg";
var mai = Math.floor(ranimg.length*Math.random());
ranimg = ranimg[Math.floor(mai)];
document.writeln('<style type="text/css">'+"\n"+'<!--'+"\n"+'#topIndex{background:url("/img/home_vi/'+ ranimg +'") no-repeat center 115px;}'+"\n"+'-->'+"\n"+'</style>');