ranimg = new Array(); 
ranimg[0]="http://yakuin-records.com/amigoblog/title1.jpg"; 
ranimg[1]="http://yakuin-records.com/amigoblog/title2.jpg"; 
ranimg[2]="http://yakuin-records.com/amigoblog/title3.jpg"; 
xx = Math.floor(ranimg.length*Math.random()); 
ranimg = ranimg[Math.floor(xx)]; 
document.write ('<style type="text/css"><!--#contentsR{background-image: url("'+ ranimg +'");background-position: top; background-repeat:no-repeat;}--></style>');