ranimg = new Array(); 
ranimg[0]="img/topimg/topimg01.jpg"; 
ranimg[1]="img/topimg/topimg02.jpg"; 
ranimg[2]="img/topimg/topimg03.jpg"; 
ranimg[3]="img/topimg/topimg04.jpg"; 
ranimg[4]="img/topimg/topimg05.jpg"; 
ranimg[5]="img/topimg/topimg06.jpg"; 
ranimg[6]="img/topimg/topimg07.jpg"; 
ranimg[7]="img/topimg/topimg08.jpg"; 
ranimg[8]="img/topimg/topimg09.jpg"; 
xx = Math.floor(ranimg.length*Math.random()); 
ranimg = ranimg[Math.floor(xx)]; 
document.write ('<style type="text/css"><!--body div#header{background: url('+ ranimg +') no-repeat right top;}--></style>');