How Do I Change The Table Selected Using A Text Box?

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HTML

PHP

MySQL

How do i change the table selected using a text box? I dont even know if it its possible but i want to display different tables but be able to type a name and have it change.

<?php
include 'config.php';

mysql_connect(localhost,$username,$password);
@mysql_select_db($database) or die( "Unable to select database");
$query="SELECT * FROM questions";
$result=mysql_query($query);

$num=mysql_numrows($result);

mysql_close();

echo "<center>Database Output</center><br><br>";

$i=0;
while ($i < $num) {

$name=mysql_result($result,$i,"Kiya_text");
$name = preg_replace("/%u([0-9a-f]{3,4})/i","\\1;",urldecode($name));

echo "$name<br>$quote<br>$bio<br><hr><br>";

$i++;
}

?>

I want to change $query="SELECT * FROM questions"; using a textbox in html
is it even possible.

Thank you in advance.