Weird problem

I am just starting with php and flash, and i was making a simple form to learn the working.

the form has two fields, username and password, and i am sending this values to a php script which simply reads this and then echoes it like

$output.=’&usename=’.$username.’&userpassword=’.$password;
echo $output;

then i am supposed to read it back in flash, and this is the problem, when i read it and display as

error_txt.text=this[“username”]+" : "+this[“userpassword”];

I get this exact output–>

‘.$username.’ '.$password;

any ideas what and where might i be wrong?