Should be as easy as this:
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$cfgsubj = "<input type=\"hidden\" maxlength=\"100\" size=\"24\" value=\"".$_SESSION['visited_pages'][count($_SESSION['visited_pages'])-1]."\" name=\"subject\" id=\"subject\" class=\"text\" />";
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BTW, there's a bug with parenthesis in that $prev_page sequence, it should be
PHP
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$prev_page = $_SESSION['visited_pages'][count($_SESSION['visited_pages'])-1];
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