problem with some functions & MYSQL in LINUX

HI I'm having a problem using some php functions in LINUX machines. I'm trying the "header" function to redirect my visitiors to a specific page & i want to generate the pages dynamically , using arguments (For ex. redir.php?img=1.jpg). It is working fine in Windows machine , but not in LINUX/UNIX . It is giving me error that headers are already sent . I don't know why it is happening. I tried many things like (1) I checked the configuration file (Php.ini) . some of the configurations r like that : ***************************************************************************** ********************* arg_separator.input = "&" arg_separator.output = "&" output_buffering = off ***************************************************************************** ********************** (2) i tried changing the code . As i was found that the argument isn't coming from the previous page. The code i used there is : *********************************** redir.php ************************************************************* global $link; if($link=="") die("error................"); header("Location: $link"); ***************************************************************************** ******************************** now if a link is like that : redir.php?link=http://www.yahoo.com , then it should redirect the visitor to the YAHOO! , but it is working in Windows & not in LINUX. In Windows , i saw this problem when the output_buffering is set to off. So i turned it on , & it is working fine in windows, but in LINUX , the same problem persists. Using "ob_start() " function , i tuned this function on (manually). I don't know how to solve this problem. I'm also unable to use MYSQL database in LINUX . It is saying that the built in PHP functions for mysql (like mysql_connect() etc.) are unknown functions. Can anybody please help me ????????? please help me ................. Thanking u NILASHIS http://www.geocities.com/cnilashis