ask about onchange and onclick php

[eluser]C_Line[/eluser]
i have a problem with onchange and onclick
i wan enter a value in textbox and call the function
like this :

========================================================
<input onchange="here()" type="text"name="qty">

<?php
function here()
{
echo "hello";
}
?>
=========================================================

but, when i entered the value, here() function didn't call
please help me, and sorry my bad english
thx