rdmimg=new Array();
rdmimg[0]="images/top/top_vis_keizai.jpg";
rdmimg[1]="images/top/top_vis_taigai.jpg";
rdmimg[2]="images/top/top_vis_enerugi.jpg";
rdmimg[3]="images/top/top_vis_gensiryoku.jpg";
rdmimg[4]="images/top/top_vis_tyuusyou.jpg";
rdmimg[5]="images/top/top_vis_tokkyo.jpg";
rdmimg[6]="images/top/top_vis_monodukuri.jpg";
rdmhead=Math.floor(rdmimg.length*Math.random());
rdmimg=rdmimg[Math.floor(rdmhead)];
document.write ('<style type="text/css">#visual-box #visual-img{height: 106px;background: url('+rdmimg+')  no-repeat center;}</style>');