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You said "if(action=="main")"
So ... it's really that or you would said "if($action=="main")" ???
the $ is important so ... perhaps phpv4 ignore this kind of mistake and not
php5
or perhaps "action" is when register global is on ... so
if miss $ before var, add it, and try again
if not work .. send a piece of code
$action = $_GET["action"];
if ($action == "main") {
/*** do think ... ***/
}...
Have fun
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