need help for changing an ajax rating system

[Arona]

hi everyone , i have an ajax rating system on my website , the problem is only users can rate and if you don't login you can't rate . i wanna remove this login part to all the viewers can rate without need to create account and login to it , because there is so few peoples do it just for a rating , so here is the code :

<?php
include '../../../config.php';
include '../../core.php';
$id = intval($_POST['id']);
$userid = intval($_COOKIE['wss_userid']);

if (isset($_COOKIE["wss_username"])) {
	$user_rated_yet = mysql_result(mysql_query("SELECT COUNT(*) as Num FROM wss_ratings WHERE user_id='$userid' AND wallpaper_id='$id'"), 0);
	if ($user_rated_yet >= 1) {
		echo ALREADY_RATED;
	}
	else {

		$wss_userid = intval($_COOKIE['wss_userid']);
		$rating = intval($_POST['rating']);

		if ($_POST['rating'] > 5 || $_POST['rating'] < 0) {
			echo 'Nope';
			exit();
		}


		$sql = mysql_query("SELECT * FROM wss_users WHERE id=".$userid."");
		$row = mysql_fetch_array($sql);
		if ($row['password'] == $_COOKIE['wss_code']) {
			mysql_query("INSERT INTO wss_ratings (wallpaper_id, user_id, rating, ip) VALUES ('$id', '$wss_userid', '$rating', '$_SERVER[REMOTE_ADDR]')");
				
			$no_of_ratings = mysql_result(mysql_query("SELECT COUNT(*) as Num FROM wss_ratings WHERE wallpaper_id='$id'"),0);
			$get_ratings = mysql_query("SELECT sum(rating) AS rating FROM wss_ratings WHERE wallpaper_id='$id'");
			$ratings_sum = mysql_fetch_array($get_ratings);

			$rating = ($ratings_sum['rating'] / $no_of_ratings);
				
			mysql_query("UPDATE wss_wallpapers SET rating='$rating' WHERE id='$id'") or die (mysql_error());
			mysql_query("UPDATE wss_users SET ratings = ratings + 1 WHERE id='".$userid."'") or die (mysql_error());
							
		}
	}
}

?>

and this one on wallpaper_main.php

// Define the 'new rating' section for the template
if(isset($_COOKIE["wss_username"]))
{
	$user_rated_yet = mysql_result(mysql_query("SELECT COUNT(*) as Num FROM wss_ratings WHERE user_id='$user[id]' AND wallpaper_id='$id'"), 0);
	if ($user_rated_yet >= 1) {
		$ur = mysql_query("SELECT * FROM wss_ratings WHERE wallpaper_id=$id AND user_id='$user[id]'");
		$user_rating = mysql_fetch_array($ur);
			
		$wallpaper['new_rating_form'] = GenerateRating($user_rating['rating'], 'wallpaper');
	}
	else {
		$wallpaper['new_rating_form'] = '<div id="rateMe" title="Rate Me...">
    	<a onclick="rateIt(this, '.$id.", '".$setting['site_url']."'".')" id="_1" title="1" onmouseover="rating(this)" onmouseout="off(this)"></a>
    	<a onclick="rateIt(this, '.$id.", '".$setting['site_url']."'".')" id="_2" title="2" onmouseover="rating(this)" onmouseout="off(this)"></a>
    	<a onclick="rateIt(this, '.$id.", '".$setting['site_url']."'".')" id="_3" title="3" onmouseover="rating(this)" onmouseout="off(this)"></a>
    	<a onclick="rateIt(this, '.$id.", '".$setting['site_url']."'".')" id="_4" title="4" onmouseover="rating(this)" onmouseout="off(this)"></a>
    	<a onclick="rateIt(this, '.$id.", '".$setting['site_url']."'".')" id="_5" title="5" onmouseover="rating(this)" onmouseout="off(this)"></a>
		</div>';
	}
}
else {
	$wallpaper['new_rating_form'] = WALLPAPER_LOGIN_TO_RATE;
}

it's most important thing for me but if it possible i wanna something else , this is rating system for a wallpaper script , the other thing that i wan it is a code to show the rate of wallpaper on thumbnail , no you can just see the rate of wallpaper when you click on it and go to select resolution page , the rating ajax code is above and here is the code that display the rate on resolution page :

<div class="wallpaper_info_right">
					<?php echo '<div class="info_item_right">'.WALLPAPER_RATING.'<br />'.$wallpaper['rating_image'].'</div>';?> </div>

i wanna make it display beside the name of wallpaper in this code :

<div class="wallpaper_item2">
	<a href="<?php echo $wallpaper['url'];?>">
		<img src="<?php echo $wallpaper['thumbnail'];?>" alt="<?php echo $wallpaper['name'];?>"  width="180" height="102" />
		<div class="wallpaper_item2_name">
		<?php   
		if ($setting['show_names'] == 1) { 
			echo $wallpaper['rating_image']; 
		} else {
			echo INFO_AND_DOWNLOAD_LINK;
		}
		 ?>
		</div>
	</a>
</div>

and here is the example site that did everything that i'm searching for it , he removed login request for rating , and make it display rate of wallpapers on thumbnails :

http://www.winhdwallpapers.com/funny/keep-calm


please help me i really need this

[Arona]

please some one help me , i tried so many other rating systems but none of them working on this script , i don't know why maybe it's because i'm completely noob but i did everything step by step but they didn't work and this one works but just with username and when i do any changes on this script it doesn't work anymore , i know it's a big ask , but i really don't have any other way , please guys pleeeeeeease help me