Maps in articles

If you've got a page that contains significant information other than the map, then you won't want to deny access to people using browsers that are not compatible with the Google maps API or which have Javascript turned off. They might be interested to read the text in the rest of the page

What you can do is to remove the <noscript> section, and the alert that you'd normally throw for a non-compatible browser. Instead, initially create the map <div> with zero size, like this.
<div id="map" style="width: 0px; height: 0px"></div>
Then, in your Javascript, if the browser is compatible, change the width and height to the required size just before creating the GMap.
var m = document.getElementById("map");
m.style.height = "400px";
m.style.width = "500px";
var map = new GMap2(m);