Creating a type of confirmation page - jQuery?

<?php
 if($_POST){
  
  $fields = array("ad"=>"Ad Text", "fn"=>"First Name", "ln"=>"Last Name", "company"=>"Company Name", "email"=>"E-mail","phone"=>"Phone","date"=>"Starting Date","comments"=>"Comments");
 
$error_message = "<b>Please complete the following fields:</b> <br>";
$error         = 0;
 
foreach($fields  as $key=>$value){
	if(!isset($_POST[$key]) || empty($_POST[$key])){
		$error_message .= $value."<br>"; 
		$error = 1;
	}
}
if(empty($error)){
  
        $weeks    = $_REQUEST["weeks"];
        $ad       = $_REQUEST["ad"];
        $fn       = $_REQUEST["fn"];
        $ln       = $_REQUEST["ln"];
        $company  = $_REQUEST["company"];
        $email    = $_REQUEST["email"];
        $phone    = $_REQUEST["phone"];
        $date     = $_REQUEST["date"];
        $comments = $_REQUEST["comments"];
        
        $mininumGroupPrice = 15;
        $additionalPrice   = 0;
        $wordPriceGroup    = 1100; // price for say 15 words is $1100 every additonal word equals to below ($wordPrice)
        $wordPrice         = "15"; // price for every additonal word
 
                $tmp_ad = str_replace(array("\n","\r","\t"), array(" "," "," "), $ad);
                $tmp_ad = str_replace("  ", " ", $tmp_ad);
                $numwords = 0;
                $words_arr = explode(" ", $tmp_ad);
                foreach ($words_arr as $word){
                  if (strlen($word)>1){
                    $numwords++;
                  }
                }
 
                $additionalWords = $numwords - $mininumGroupPrice;
                
                if($additionalWords > 0){
                        $additionalPrice = $additionalWords * $wordPrice;
                }else{
                        // the words is not exceeding 15 words
                        $additionalPrice = 0;
                }
                //     $total = $numwords * $wordprice;
                $total = $wordPriceGroup + $additionalPrice;
               
                print "Word Count:" . $numwords ."<br />";
                print "Text:" . $ad ."<br />";
                print "Weeks to Run:" . $weeks ."<br />";
                print "Price:" . $total;  
  }  
}       
if(isset($error) && !empty($error)){
  print $error_message;
}
?>
 
<h3>Ad Text</h3>
<form name="calculate" action="index.php?p=calc" method="post" class="niceform" />
        <label for="weeks">Weeks to run ad:</label><br />
        <select name="weeks" id="weeks">
                <option value="1">1 week</option>
                <option value="2">2 weeks</option>
                <option value="3">3 weeks</option>
                <option value="4">4 weeks</option>
        </select><br />
        <p>$1110 - 15 words</p>
        <label for="ad">Ad Text:</label><br />
        <textarea name="ad" id="ad" rows="5" cols="20"></textarea><br />
        
        <label for="fn">First Name:</label><br />
        <input type="text" name="fn" id="fn" size="20" /><br />
        <label for="ln">Last Name:</label><br />
        <input type="text" name="ln" id="ln" size="20" /><br />
        <label for="company">Company Name:</label><br />
        <input type="text" name="company" id="company" size="20" /><br />
        <label for="email">E-mail:</label><br />
        <input type="text" name="email" id="email" size="20" /><br />
        <label for="phone">Phone:</label><br />
        <input type="text" name="phone" id="phone" size="20" /><br />
        <label for="date">Starting Date:</label><br />
        <input type="text" name="date" id="date" size="20" /><br />
        <label for="comments">Comments:</label><br />
        <textarea name="comments" id="comments" rows="5" cols="20"></textarea><br />
        
        <input type="submit" name="submit" value="Calculate!" />
</form>

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