show div if variable is not empty - html

Question

I'd like to show this div with a "add to cart" button IF the price contained in $row_thumbs['Listino 9'] is not empty. How can that be accomplished? Jquery?
<div id="button" style="padding: 10px 0px 10px 0px;">
<form name="eCart1_1_ATC_<?php echo $row_thumbs["Cod."]; ?>" method="POST" action="<?php echo $_SERVER["PHP_SELF"]; ?><?php echo (isset($_SERVER["QUERY_STRING"]) && $_SERVER["QUERY_STRING"] != "")?"?".$_SERVER["QUERY_STRING"]:""; ?>">
<input type="hidden" name="eCart1_1_ID_Add" value="<?php echo $row_thumbs["Cod."]; ?>" >
<input type="hidden" name="eCart1_1_Quantity_Add" value="1" size="2" >
<input type="image" src="images/acquista.png" width="95" border="0" class="eC_ImageButton" value="Aggiungi al carrello" name="eCart1_1_ATC"></form>
</div>

Answer 1

uncomment the first line, then the BUTTON will be showed, make sure the script runs on a server and also I would never make spaces $row_thumbs['ListinoHERE9']
<?php
//$row_thumbs['Listino_9']='cheater';
if($row_thumbs['Listino_9']!='') {
echo '<div class="button"> B U T T O N</div>';
}
?>
<style type="text/css">
.button {
padding:5px;
width:100px;
background-color:gray;
}
.button:hover {
cursor:pointer;
background-color:orange;
}
</style>
<script src="http://code.jquery.com/jquery-latest.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$('.button').click(function(){
$('.show-div-if-button-gets-clicked').toggle();
});
});
</script>
<div class="show-div-if-button-gets-clicked" style="display:none;">
<form name="eCart1_1_ATC_<?php echo $row_thumbs["Cod."]; ?>" method="POST" action="<?php echo $_SERVER["PHP_SELF"]; ?><?php echo (isset($_SERVER["QUERY_STRING"]) && $_SERVER["QUERY_STRING"] != "")?"?".$_SERVER["QUERY_STRING"]:""; ?>">
<input type="hidden" name="eCart1_1_ID_Add" value="<?php echo $row_thumbs["Cod."]; ?>" >
<input type="hidden" name="eCart1_1_Quantity_Add" value="1" size="2" >
<input type="image" src="images/acquista.png" width="95" border="0" class="eC_ImageButton" value="Aggiungi al carrello" name="eCart1_1_ATC"></form>
</div>