query string syntax issues

[azda2]

i’ve been getting syntax error:

Parse error: syntax error, unexpected '"', expecting T_STRING or T_VARIABLE or T_NUM_STRING

for this:

$q = mysql_query("SELECT * FROM users WHERE username='$_POST["username"]' AND password='$_POST["password"]'");

could someone tell me how i can fix it so the query works? o.o
im pretty new to php, so im not the best at fixing syntax errors lol

[aj1]

[php]$q = mysql_query(“SELECT * FROM users WHERE username=’”. $_POST[“username”]."’ AND password=’". $_POST[“password”]."’");[/php]