Well ... the answer is all in your error messages (although I have to admit they don't just say, "here, fix it like this".
mellowman wrote:Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /home/content/p/l/i/plinskidesign/html/web4designzsite/login/login.php:12) in /home/content/p/l/i/plinskidesign/html/web4designzsite/login/login.php on line 27
We go to line 27 and see session_start(). Headers already sent ey? Well ... 5 minutes of research later (a search here or on php.net should turn up something) you'll find that no output can be sent to the browser before session_start(). The answer, move it up to line 1, without so much a space before it.
mellowman wrote:Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in /home/content/p/l/i/plinskidesign/html/web4designzsite/login/login.php on line 35
We scroll on down to line 35 and take a look ... we find that $result was what we used in mysql_num_rows(). Ok, so the result was with $result as it's the only argument passed. We look up to the previous line of code and see how it was set. How could it not be a valid resource? Maybe the query has a problem ... a quick jump over the the PHP manual page for mysql_query() should give some insight on how to catch query errors.
HERE (in particular, look at the use of die() in the first example).
While looking at this error, you'll want to pass your eye over the query ... just to make sure you cant see anything wrong that would cause the query to fail. My first thought is ... "What is $encrypt, and why is it being used to match the password"? A few lines above reveal where a point of confusion may have occurred.
mellowman wrote:Warning: main(“loginhtml”): failed to open stream: No such file or directory in /home/content/p/l/i/plinskidesign/html/web4designzsite/login/login.php on line 37
Hmmm .... the include statement on line 37 looks as though it should work ... but I'm wondering what the deal is with the unusual quotes. They look like the ones that get automatically switched out in MS Word and the like. I'd try using a plain text editor and changing them back to normal quotes. That's where I'd start anyhow.
Hope that helps.