[Plugin: WordPress Mobile Pack] iphone “handler could not be removed” error

Update: so it seems like it’s this script that’s responsible (see below). not sure if that script is from this mobile pack plugin or not. it should be noted that this popup message does not show up when viewing the desktop site on my iphone.

script:

<script type="text/javascript"><!-- 

	            function addEvent(elm, evType, fn, useCapture)
	            // addEvent and removeEvent
	            // cross-browser event handling for IE5+,  NS6 and Mozilla
	            // By Scott Andrew
	            {
	              if (elm.addEventListener){
	                  elm.addEventListener(evType, fn, useCapture);
	                  return true;
	              } else if (elm.attachEvent){
	                  var r = elm.attachEvent("on"+evType, fn);
	                  return r;
	              } else {
	                  alert("Handler could not be removed");
	              }
	            }
	            function externalLinks() {
	             if (!document.getElementsByTagName) return;
	             var anchors = document.getElementsByTagName("a");
				 var newwindows =0;
	             for (var i=0; i<anchors.length; i++) {
	               var anchor = anchors[i];
	               if (anchor.getAttribute("href") && anchor.getAttribute("rel") == "external") {
	                        anchor.setAttribute("target","_blank");
							newwindows++;
					}
	             }
	            } 

	            addEvent(window, "load", externalLinks); 

	            //-->
	            </script>