Undefined index

I get this error when I open the page where you can choose a city to post an ad. Error seems to be in the second line of the code:
$targetview = $_GET['targetview'];
$citylink_view = "view=$targetview&postevent=$_GET[postevent]";
//$citylink_view = "view=selectcity&targetview=$targetview";
	$sort1 = "ORDER BY countryname";
	$sort2 = "ORDER BY cityname";
	$sort1 = "ORDER BY c.pos";
	$sort2 = "ORDER BY ct.pos";

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jimgordonAuthor Commented:
I changed into:

$postevent = isset($_GET['postevent']);
$targetview = $_GET['targetview'];
$citylink_view = "view=$targetview&postevent=$postevent";

and it works now. It is correct?
Ashish PatelCommented:
 in you previous statement you forgot the single quote around the postevent

$citylink_view = "view=$targetview&postevent=$_GET['postevent']";
Ashish PatelCommented:
But your code which you changed is the right way of doing things.

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