Site working but sometimes not

1

this is a site in progress (http://www.sundanceclub.be/v07/)

home, deejays, about sdc, musicplayer should be working, (parties, pix 'n tunes, guestbook don’t work yet)

my question is: when i uploaded it yesterday to test it on the server, it seemed all be working fine. Now when I surfed to the url, the homepage wasn’t loading in it’s box, and ‘deejays’ also.
and when i clicked again, it showed, and then again it didn’t, etc. etc…

how does the site work:
1 major swf where external swf’s are loaded in a empty mc, al those external swf’s call a php-file which reads out the db…

is there something i should pay better attention to ?

some source-files:

http://www.sundanceclub.be/v07/sdc_try03.fla (main)
http://www.sundanceclub.be/v07/sdc_about.fla (one of the imported swf’s)

code from the read_db.php:

<?php error_reporting(E_ALL); // zet op 0 als de site live is, E_ALL tijdens ontwikkeling ?>

<style type="text/css">

</style>

<?php
if(! include("databaseserver.inc.php")) { // preferrably outside the root..
	echo '&r=&b='.urlencode('De file met de database connectie parameters kon niet geinclude worden door '.$_SERVER['PHP_SELF']).'&';
	exit;
}
?>

<?php
function connecttodatabase() {
	if (!$databaseLink = mysql_connect(MYSQL_SERVER, MYSQL_USER, MYSQL_PASSWORD)) { // connectie parameters uit de include files
		return false;
	}
	if (!mysql_select_db(MYSQL_DATABASE, $databaseLink)) {
		return false;
	}
		return $databaseLink; // we arrive at this point if connection is made, and database is selected !
} // end databaseconnection function
?>

<?php
if(!$link = connecttodatabase() ) {
	echo '&r=0&b='.urlencode('Er kon geen verbinding met de database gemaakt worden, pas de database connectie parameters aan in '.$_SERVER['PHP_SELF']). '&';
	exit;
}
?> 


<?php 
// als we hier komen, is er een actieve databaseverbinding en gaan we door met het script.

// nu "m"-parameter uit flash opvangen in php, bewaren in variabele $mode
// wel eerst controleren of parameter bestaat, anders op NULL zetten

$mode = isset($_REQUEST['m']) ? $_REQUEST['m'] : NULL; 

?>

<?php
////////////////////////////////////////////////////////////////////////////////////////////////
/////// de waarden van de "m"-parameter die we opvangen wordt uit de $_REQUEST-array gehaald  /////////
////////////////////////////////////////////////////////////////////////////////////////////////

	
	
		// haalABOUT
	case "haalAbout":
		$sql = "SELECT about_titel, about_kop, about_text, DATE_FORMAT(about_datum, '%d-%m-%Y') as datum
		FROM sdc_about
		WHERE
		about_zichtbaar = 1
		ORDER BY about_datum DESC, about_id DESC LIMIT 0,10";
		
	if(!$r = mysql_query($sql, $link)) {
		echo '&r=0&b='.urlencode('about info kon niet opgehaald worden: ').mysql_error().'&';
		exit;
	}
	$output=NULL;
	$output .= '<font size="18" color="#F9CB11" face="georgia"><b>*about sundanceclub</b></font><br />';
	while($w = mysql_fetch_object($r)) {

		  $output .= '<font color="#FFFFFF"><b>' . htmlentities(stripslashes($w->about_titel)). '</b></font><br/>';
		  //$output .= '<font color="#FDEACE">'. htmlentities(stripslashes($w->about_kop)) . '</font><br />';
		  $output .= '<font color="#FDEACE">'. nl2br(stripslashes(ereg_replace("\r",'',$w->about_text))). '</font><br>';
		  $output .= '<font color="#BD7406">'. $w->datum . '</font><br><br>';
	}
	$output = urlencode($output); // zorg voor veilig netwerk transfer naar flash
	
	echo '&r=1&b='.urlencode('about-info succesvol opgehaald').'&n='.$output.'&';
	exit;
	break;
	
	
	case "andereParam":
	break;
	
	default:
	break;
}
?>

<?php
	echo'&r=0&b='.urlencode('Geen of onjuiste parameters meegestuurd').'&';
	sleep(1);
	exit;
?>