how to make this code work?

[tharindu96]

http://localhost/download.php?lt =a&sr=0&sp=9

lt = letter(eg:- a,b)
sr = start
sp = stop

   <?php
	if(isset($_GET['lt'])){
		$lt = $_GET['lt'];
		if(isset($_GET['sr'])&&isset($_GET['sp'])){
		$sr = $_GET['sr'];
		$sp = $_GET['sp'];
			if(!empty($lt)){
				if(!empty($sr)&&!empty($sp)&&$sp!=9){
					if(strlen($lt) == 1){
						echo '<h2>'.strtoupper($lt).' Games</h2>';
						$nquery = "SELECT * FROM `games` WHERE `flname` = '".$lt."' OR '".strtoupper($lt)."' ORDER BY `created` ASC LIMIT ".$sr." ".$sp."";
						if($nquery_result = mysql_query($nquery)){
							if($nquery_num = mysql_num_rows($nquery_result)){
								while($nquery_r = mysql_fetch_assoc($nquery_result)){
								$nquery = "SELECT * FROM `games` WHERE `flname` = '".$lt."' OR '".strtoupper($lt)."' ORDER BY `created` ASC LIMIT ".$sr." ".$sp."";
								$nquery_result = mysql_query($nquery);
								$nquery_r = mysql_fetch_assoc($nquery_result);
								echo '<article>';
								echo '<a href="game.php?id='.$nquery_r['id'].'"><div id="g_head">'.$nquery_r['name'].'</div></a><br>';
								echo '<a href="game.php?id='.$nquery_r['id'].'"><img src="'.$nquery_r['image'].'" alt="'.$nquery_r['alt'].'" width = "150px"></a>';
								echo '</article>';				
								}
								while($sp<$nquery_num){
									$sr = $sr + 10; 
								}
							}else{
								echo 'Ok2';
							}
						}else{
							echo 'Ok3';	
						}
					}
				}
			}
		}
	}else{
		echo '<h2>Latest Games</h2>';
		$nquery = "SELECT * FROM `games` ORDER BY `created` DESC LIMIT 9";
		if($nquery_run = mysql_query($nquery)){
			while($nquery_result = mysql_fetch_assoc($nquery_run)){
				echo '<article>';
				echo '<a href="game.php?id='.$nquery_result['id'].'">'.$nquery_result['name'].'</a><br>';
				echo '<a href="game.php?id='.$nquery_result['id'].'"><img src="'.$nquery_result['image'].'" alt="'.$nquery_result['alt'].'" width = "150px"/></a><br>';
				echo '</article>';
			}
		}
	}
	?>

[r035198x]

What is the code doing and what do you want the code to do instead?