Return key not being suppressed

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ASP.NET

Visual-Studio

MS-Excel

, +

I have a custom gridview with an export to excel feature, a column for edit/delete buttons in each row that is populated, and a footer that allows for new items to be added.

Somthing a little like this:

Showing 1-8 of 8	Results per page: 25 50 All |Export Button|
BRONCO	Edit / Delete
FLTPLAN	Edit / Delete
LASSO	Edit / Delete
PINTO	Edit / Delete
RANCH	Edit / Delete
RODEO	Edit / Delete
TEXAN	Edit / Delete
TEST	Edit / Delete
|Empty Text Box|	Add

(excuse my lazy html)

After navigating to that page a user would be able press the return key and, because it is the only button on the page, the export to excel button would be activated. I used the following Javascript to stop this:

<script type="text/javascript">
        function stopRKey(evt) { 
                  var evt = (evt) ? evt : ((event) ? event : null); 
                  var node = (evt.target) ? evt.target : ((evt.srcElement) ? evt.srcElement : null); 
                  if ((evt.keyCode == 13) && (node.type=="text"))  {return false;} 
                } 
                document.onkeypress = stopRKey;
            
</script>

While this is great for when the user navigates to the page, after editing an item in the gridview, the user can press enter and get the export button again. I know the script is working so I am absolutely perplexed why it's still allowing the return key after I edit/add something in the gridview.

Other (possibly) noteworthy items:
The gridview is in an update panel. Putting the javascript in the udp doesn't change anything.
The gridview is using a linq data source.
I've tried using the jscript in both the .aspx page and the master page (and both at the same time for some illogical reason).