[Resolvido] Erro que não consigo resolver

Código de um sistema de alerta:

> <?phpinclude "config.php";

header("Content-Type: text/html; charset=iso-8859-1");

$ip = $_SERVER["REMOTE_ADDR"];

$data = time();

 

?>

 <?php

 $sql = mysql_query("SELECT * FROM alerta WHERE data='$data'");

while($row=mysql_fetch_array($sql)){

$num = mysql_num_rows(mysql_query("SELECT * FROM alerta_mostrada WHERE alerta='$row[id]' AND ip='$ip'"));

if($num>0){

} else {

function strip_only($str, $tags) {

 if(!is_array($tags)) {

 $tags = (strpos($str, '>') !== false ? explode('>', str_replace('<', '', $tags)) : array($tags));

 if(end($tags) == '') array_pop($tags);

 }

 foreach($tags as $tag) $str = preg_replace('#</?'.$tag.'[^>]*>#is', '', $str);

 return $str;

}

 

$text = strip_only($row["texto"], array('p', 'em'));

?>

<script type="text/javascript" src="[http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js">](http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js)

<script type="text/javascript" src="[http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.1/jquery-ui.min.js">](http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.1/jquery-ui.min.js)

<link href="[http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/base/jquery-ui.css"](http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/base/jquery-ui.css) rel="stylesheet" type="text/css"/>

<script>

function fecha(id){

$("#alerta-"+id).fadeOut();

}

$(function(){

$(".alerta").draggable({ handle: '#cima' });

});

</script>

<div id="alerta-<?php echo $row["id"];?>" style="width:282px;position:fixed;z-index:999999" class="alerta">

<div id="cima" style="cursor:move;background:url(cim.png) no-repeat;width:282px;height:30px;">

<div id="fecha" onClick="fecha('<?php echo $row["id"];?>')" style="cursor:pointer;background:url(fechar.png) no-repeat;width:13px;height:14px;float:right;opacity:0.6;margin-top:6px;margin-right:10px;"></div>

</div>

<div id="meio_alerta" style="background:url(meio.png) repeat-y;width:282px;">

<div style="max-width:260px;word-wrap:break-word;font-family:arial;font-size:13px;color:#000;padding-left:10px;"><?php echo $text;?></div>

<div onClick="fecha('<?php echo $row["id"];?>')" onmouseover="this.style.opacity=1" onmouseout="this.style.opacity=0.5" id="ok" style="background:url(ok.gif) no-repeat;cursor:pointer;margin:0 auto;opacity:0.5;width:50px;height:22px;"></div>

</div>

<div id="fim" style="background:url(baixo.png) no-repeat;width:282px;height:16px;"></div>

</div>

<?

$dell = mysql_query("INSERT INTO alerta_mostrada(alerta, ip) VALUES ('$row[id]', '$ip')");

}

}

?>

Erro: Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /home/hitshab1/public_html/alrt/recebe_alerta.php on line 10

Não sei o que fazer me ajudem!