Not able to add data to a MySQL database

Hi, I am not able to insert data into my mysql database using php even if i use a simple code as follows : <?php $link=mysql_connect("localhost","username","password"); mysql_select_db("test_db"); $query="INSERT INTO 'login' ('uname','access') VALUES ('try','super')"; mysql_query($query,$link); ?> even after running this code on the server, there was no change in the mysql database as seen by the phpmyadmin. Ive tried it with another file and another table, but its not just happening. Though earlier attempts with Mysql had worked, but those only involved reading data from the database and I havent been able to write to it even once since I have started working. Please help me out with this, in case there is some information that I should have provided here and its not there please ask for it, I will be more than happy to provide it. Thanks Vaibhav