PHP/MYSQL/JAVA Search Box

Hi, i have the below code working for my dynamic website search.
This works fine, however I'm having trouble implementing a message saying "No Result" when a user types a string that doesn't match anything in the database, like for example, the user types in the letter 'z' which doesn't match any titles.

Also, how would i implement a cache so the input doesn't keep calling the database every time a letter is pressed? Still trying to figure all this java stuff out...could someone please help me with this?!

function getSuggestions(value) {
	if(value != "") {
		$.post("/search.php", {userPart:value}, function(data) {
			$("#search_display").html(data);
		});
	} else {
		removeSuggestions();
	}
}
function removeSuggestions() {
	$("#search_display").html("");
}
function addText(value) {
	$("#search-box").val(value);
}

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$userPart = mysql_real_escape_string(addslashes($_POST['userPart']));
$search_result = mysql_query("SELECT... WHERE subcat_name LIKE '%".$userPart."%' LIMIT 0, 16") or die (mysql_error());

while ($row_search_result = mysql_fetch_assoc($search_result)) {
	echo "<div class='link' onClick='addText(\"".$row_search_result['subcat_name']."\");'><a href='".$row_search_result['search_url']."'>".$row_search_result['subcat_name']."</a><br />in ".$row_search_result['cat_name']."</div>";
}

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Dave BaldwinFixer of ProblemsCommented:
Check the number of rows returned.

$userPart = mysql_real_escape_string(addslashes($_POST['userPart']));
$search_result = mysql_query("SELECT... WHERE subcat_name LIKE '%".$userPart."%' LIMIT 0, 16") or die (mysql_error());
$num_rows = mysql_num_rows($search_result);
if($num_rows == 0) echo "<div>No Results.</div>";
else {
while ($row_search_result = mysql_fetch_assoc($search_result)) {
	echo "<div class='link' onClick='addText(\"".$row_search_result['subcat_name']."\");'><a href='".$row_search_result['search_url']."'>".$row_search_result['subcat_name']."</a><br />in ".$row_search_result['cat_name']."</div>";
}
}

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