how to make paging with class and ajax

imran.php

<?php 
class pagination{
            var $row;
            var $p=1; 
            var $limits;
            var $count_all=0,$sql,$total,$table,$totalres,$totalpages;
            var $r,$i;

            function connect(){

                $connectect = mysql_connect("localhost","root","") or die(mysql_error());
                $selected = mysql_select_db(mydata) or die(mysql_error());


            }

            function setMax($max_r){

                  $this->p = $_GET['p'];
                  $this->max_r = $max_r;

                      if(empty($this->p))
                      {
                        $this->p = 1;
                      }

                  $this->limits = ($this->p - 1) * $this->max_r;

            }    

            function setData($table){

                  $this->table = $table;
                  $this->sql = "SELECT * FROM ".$this->table." LIMIT ".$this->limits.",".$this->max_r."";
                    $this->sql = mysql_query($this->sql) or die(mysql_error());
                  $this->total = "SELECT * FROM ".$this->table."";
                  $this->totalres =  mysql_query($this->total) or die(mysql_error());
                  $this->count_all = mysql_num_rows($this->totalres);
                  $this->totalpages = ceil($this->count_all / $this->max_r);
            }

            function display(){

                    $fields=mysql_num_fields($this->totalres);


                      echo "<table border=1 width=100%><tr>";
                        for ($i=0; $i < mysql_num_fields($this->sql); $i++) //Table Header
                        { 
                            print "<th>".mysql_field_name($this->sql, $i)."</th>"; 
                        }
                        echo "</tr>";
                        while ($row = mysql_fetch_row($this->sql)) 
                        { 
                            echo "<tr>";
                            for ($f=0; $f < $fields; $f++) 
                            {
                                echo "<td>$row[$f]</td>"; 
                            }
                            echo "</tr>\n";
                        }
                        echo "</table><p>";

            }

            function displayLinks($show){

                  $this->show = $show; // How many links to show

                   echo "<br><br>";

                  if($this->p > 1) // If p > then one then give link to first page
                  {
                        echo "<a href=?p=1> [FIRST] </a>  ";    
                  }
                  else{ // else show nothing
                        echo "";
                  }
                  if($this->p != 1){ // if p aint equal to 1 then show previous text

                          $previous = $this->p-1;
                          echo "<a href=?p=$previous> [ PREVIOUS ] </a>";

                  }
                  else{ //else show nothing
                          echo "";
                  } 
                  for($i =1; $i <= $this->show; $i++) // show ($show) links
                  {

                        if($this->p > $this->totalpages){ // if p is greater then totalpages then display nothing
                            echo "";
                        }
                        else if($_GET["p"] == $this->p){ //if p is equal to the current loop value then dont display that value as link
                            echo $this->p;
                        }
                        else{
                            echo " <a href=?p=".$this->p."&maxrow=".$this->max_r."> ( ".$this->p.") </a>"; // else display the rest as links
                        }

                        $this->p++; //increment $p  
                  }
                    echo "....."; // display dots

                   if($_GET["p"] == $this->totalpages){// if page is equal to totalpages then  dont display the last page at the end of links
                            echo "";
                   }
                   else // else display the last page link after other ones
                   {
                        echo "<a href=?p=".$this->totalpages."&maxrow=".$this->max_r."> ( ".$this->totalpages.") </a>"; 
                   }
                   if($_GET["p"] < $this->totalpages)// if p is less then total pages then show next link
                   {
                        $next = $_GET["p"] + 1;
                        echo "<a href=?p=$next&maxrow=".$this->max_r."> [ NEXT >] </a>";    
                   }

                   echo "<br><br>";

            }

    }
?>
<html>
    <head>
    <title> paging with class and ajax</title>
        <script type="text/javascript">
            function showUser(str)
            { 
            if (window.XMLHttpRequest)
            {// code for IE7+, Firefox, Chrome, Opera, Safari
            xmlhttp=new XMLHttpRequest();
            }
            else
            {// code for IE6, IE5
            xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
            }
            xmlhttp.onreadystatechange=function()
            {
            if (xmlhttp.readyState==4 && xmlhttp.status==200)
            {
            document.getElementById("paging").innerHTML=xmlhttp.responseText;
            }
            }
            xmlhttp.open("GET","paging.php?maxrow="+str,true);
            xmlhttp.send(); }
        </script>
    </head>
    <body>
        <form name="frm" method="post" >
            select row per page
            <select name="users" onChange="showUser(this.value)">
            <option value="1">1</option>
            <option value="2">2</option>
            <option value="3">3</option>
            <option value="4">4</option>
            <option value="5">5</option>
            </select>
        </form>
        <br />
        <div id="paging">
            <?php 
            $page= new pagination;
            $page->connect();

            if(isset($_REQUEST['maxrow'])){
            $page->setMax($_REQUEST['maxrow']);
            }else{
            $page->setMax(2);
            }
            $page->setData("login");
            $page->display();
            $page->displayLinks(5);
            ?>
        </div>
    </body>
</html> 


paging.php

<?php
$row=$_GET['maxrow'];
class pagination{

            var $row;
            var $p=1; 
            var $limits;
            var $count_all=0,$sql,$total,$table,$totalres,$totalpages;
            var $r,$i;

            function connect(){

                $connectect = mysql_connect("localhost","root","") or die(mysql_error());
                $selected = mysql_select_db(mydata) or die(mysql_error());


            }

            function setMax($max_r){

                  $this->p = $_GET['p'];
                  $this->max_r = $max_r;

                      if(empty($this->p))
                      {
                        $this->p = 1;
                      }

                  $this->limits = ($this->p - 1) * $this->max_r;

            }    

            function setData($table){

                  $this->table = $table;
                  $this->sql = "SELECT * FROM ".$this->table." LIMIT ".$this->limits.",".$this->max_r."";
                    $this->sql = mysql_query($this->sql) or die(mysql_error());
                  $this->total = "SELECT * FROM ".$this->table."";
                  $this->totalres =  mysql_query($this->total) or die(mysql_error());
                  $this->count_all = mysql_num_rows($this->totalres);
                  $this->totalpages = ceil($this->count_all / $this->max_r);
            }

            function display(){

                    $fields=mysql_num_fields($this->totalres);


                      echo "<table border=1 width=100%><tr>";
                        for ($i=0; $i < mysql_num_fields($this->sql); $i++) //Table Header
                        { 
                            print "<th>".mysql_field_name($this->sql, $i)."</th>"; 
                        }
                        echo "</tr>";
                        while ($row = mysql_fetch_row($this->sql)) 
                        { 
                            echo "<tr>";
                            for ($f=0; $f < $fields; $f++) 
                            {
                                echo "<td>$row[$f]</td>"; 
                            }
                            echo "</tr>\n";
                        }
                        echo "</table><p>";

            }

            function displayLinks($show){

                  $this->show = $show; // How many links to show

                   echo "<br><br>";

                  if($this->p > 1) // If p > then one then give link to first page
                  {
                        echo "<a href=?p=1&maxrow=".$this->max_r."> [FIRST] </a>  ";    
                  }
                  else{ // else show nothing
                        echo "";
                  }
                  if($this->p != 1){ // if p aint equal to 1 then show previous text

                          $previous = $this->p-1;
                          echo "<a href=?p=$previous&maxrow=".$this->max_r."> [ PREVIOUS ] </a>";

                  }
                  else{ //else show nothing
                          echo "";
                  } 
                  for($i =1; $i <= $this->show; $i++) // show ($show) links
                  {

                        if($this->p > $this->totalpages){ // if p is greater then totalpages then display nothing
                            echo "";
                        }
                        else if($_GET["p"] == $this->p){ //if p is equal to the current loop value then dont display that value as link
                            echo $this->p."&maxrow=".$this->max_r;
                        }
                        else{
                            echo " <a href=?p=".$this->p."&maxrow=".$this->max_r."> ( ".$this->p.") </a>"; // else display the rest as links
                        }

                        $this->p++; //increment $p  
                  }
                    echo "....."; // display dots

                   if($_GET["p"] == $this->totalpages){// if page is equal to totalpages then  dont display the last page at the end of links
                            echo "";
                   }
                   else // else display the last page link after other ones
                   {
                        echo "<a href=?p=".$this->totalpages."&maxrow=".$this->max_r."> ( ".$this->totalpages.") </a>"; 
                   }
                   if($_GET["p"] < $this->totalpages)// if p is less then total pages then show next link
                   {
                        $next = $_GET["p"] + 1;
                        echo "<a href=?p=$next&maxrow=".$this->max_r."> [ NEXT >] </a>";    
                   }

                   echo "<br><br>";

            }

    }
$page= new pagination;
$page->connect();
$page->setMax($row);
$page->setData("login");
$page->display();
$page->displayLinks(5);
?>