var spcbg
do spcbg = Math.random().toString().charAt(2);
while (spcbg > 5 || spcbg < 1);
document.writeln("<style type=\"text/css\"><!--");
document.writeln("#advertisement2{background:url(../images/ad/" + spcbg + ".jpg);");
document.writeln("width:282px;height:184px;}");
document.writeln("--></style>");