Url called from form question

HELP! I created a form that allows the user to enter a number (SEATPLAN). The code below is executed on a custom PL/SQL button. It does not seem to work. The url generated runs fine typed directly into the url of a browser. But the called url from the form just brings up a blank browser. Any help would be appreciated.
DECLARE
my_url varchar2(1000);
v_id VARCHAR2(18);
BEGIN
v_id := p_session.get_value_as_VARCHAR2(p_block_name=>'DEFAULT',p_attribute_name=>'A_SEATPLAN');
my_url := 'http://mydomain.com/||v_id||'.pdf';
PORTAL30.wwa_app_module.set_target(my_url,'CALL');
END;
Thanks in advance

Hi,
It seems the URL created by you
my_url := 'http://mydomain.com/||v_id||'.pdf'
has a missing single quote
Try this
my_url := 'http://mydomain.com/'||v_id||'.pdf'
Thanks
Vineet

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Dump from the application file.
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