I have set up a image upload script for members. However I am now trying to insert a defaultimage (defaultimage.png) when people register.

The problem is the code below insers "defaultimagepng" and not "defaultimage.png". Can anyone advise how I can insert "defaultimage.png"?

Do I need to set up a string for this or is there a different way to do this.

   $firstname = mysql_real_escape_string(trim($_POST['firstname']));
    $surname = mysql_real_escape_string(trim($_POST['surname']));
        $registerEmail = trim($_POST['email']);   
		$logo = (defaultimage.png);   
        $registerPassword = trim($_POST['password']);  
        $registerConfirmPassword  = trim($_POST['confirmPassword']);