i have created a poll with phpPolls script for my site..i modified it a little and everything should work well but this code doesn't. I want to show the poll when someone comes to my site,but when he votes the page reloads and it should show the results, however if i comment out everything below else { then it works but if i leave the code like this

if(isset(!$show_results)) {
poll_generateUI(1,"http://localhost/Celisvet/index.php?show_results=1"); }
else {
poll_viewResults(1); }

then it doesn't. I tried several ways of writing this if...else statement, I even tried <?php if(...): .. else: ..
, but nothing works. this is the error i get from the above code: Parse error: parse error, expecting `T_VARIABLE' or `'$'' in c:\inetpub\wwwroot\Celisvet\index.php on line 909
This is really annoying me.
any ideas?