Fatal error: Call to undefined function: tep_session_name()

[jadegirl]

HELP!

 

My site has completely gone down with this error message.

 

Fatal error: Call to undefined function: tep_session_name() in c:\hosting\webhost4life\member\jadegirly2k\catalog\includes\application_top.php on line 150

 

I was installing a new page and it went fine until I changed the filename.php file and I got this error message

 

Warning: session_start(): Cannot send session cookie - headers already sent by (output started at c:\hosting\webhost4life\member\jadegirly2k\catalog\includes\filenames.php:68) in c:\hosting\webhost4life\member\jadegirly2k\catalog\includes\functions\sessions.php on line 67.

 

which I thought I got because I didn't set the CHMOD 777 cause I didn't know what it was. Then when I clicked on any of the categories I got the fatal error message and now my site is completely down.

 

plz plz plz help me.