function ran(){
  var table = [
�@"http://pakuri.eromoe.com/search/rank.cgi?mode=r_link&id=347",
�@"",
�@"",
�@""
];
var objDate = new Date();
var myURL = table[objDate.getSeconds() % 4];

document.write( '<IFRAME SRC="',myURL,'" name="sample" width="0" height="0">' );
document.write( '</IFRAME>' );

}