PHP vars to JS?

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Hello,

How can I get my PHP variable values to a javascript?

Here's the code:

<SCRIPT>
function btnOKClick($file) {
  DO STUFF TO IMAGE
/<SCRIPT>

<input type="submit" name="btnOK" value="OK" 
onClick="javascript:btnOKClick($txtFileName)">
<BUTTON ID=btnCancel type=reset onClick="window.close();">Cancel</BUTTON>

<?php
$sql="SELECT * FROM images ORDER BY 'date' DESC";
$result=mysql_query($sql);
$num = mysql_num_rows($result);
$cur = 1;
while ($num >= $cur) {
$row = mysql_fetch_array($result);
$id = $row["id"];
$iso = $row["iso"];
$thumpnail = $row["thumpnail"];
$date = $row["date"];

echo "<div class=\"float\">";
echo "<div align=\"center\"><img src=\"$thumpnail\"></a><br /></div>";
echo "<div align=\"left\">$ladattu</div>";
 // File path as value here. I need to send this to Javascript
echo "<div align=\"left\"><input type=\"checkbox\" name='txtFileName' 
value='$thumpnail'>ADD</div>";
 // File path as value here. I need to send this to Javascript
echo "</div>";
$cur++;
}
?>

There's two buttons OK/Cancel at the top of the page. Then image thumpnails 
are looped to screen as many times there are DB entries. Under each 
thumpnail there's checkbox with ADD text. The checkbox value is/should be 
path to the image file. So I need this path info in the javascript to handle 
the image when user clicks OK button but I don't know how?

Thanks
-Will

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