This script uses MySQL table standards and will effectively pull multipliable random rows in one query.

PHP MySQL random row.php

function getRandomMySQLRows($table, $rows, $fields = "*"){
 // $table  = MySQL table
 // $rows   = number of rows to randomly select
 // $fields = fields to select separated by a comma
 // returns a string with the SQL that needs to be preformed

 if($rows == 0){ return ""; };

 $result = mysql_query("SELECT MAX(id) FROM $table WHERE 1");
 $count  = mysql_result($result,0,0);

 $i = 0;
 $returns = Array();
 
 while($i <= $rows){
  $rand   = rand(1,$count);

  if($i == 0){
   $query_this = "SELECT $fields FROM $table WHERE id > $rand LIMIT 1";
  } else {
   $query_this .= " UNION SELECT $fields FROM $table WHERE id > $rand LIMIT 1";
  }

  $i ++;
 }

 return $query_this;
}