random size with 2 fixed values

[chisburg]

Hi,
im using the code below to load instagram images then I'm giving them a random width.
Id like to alter the random with function so that there's only 2 different values to randomize. E.g all images ('maxWidth') will either become 200px or 300px.

	$.ajax({
        type: "GET",
        dataType: "jsonp",
        cache: false,
        url: "https://api.instagram.com/v1/users/178173879/media/recent/?access_token=178173879.e651f2a.16d3f37736f24149b6cca8b03e2ace79",
        success: function(data) {
        
	for (var i = 0; i < 10; i++) {
			maxWidth = Math.floor(115 + (Math.random() * 135));
	$("#container_content").append("<div class='instagram item'> <a target='_blank' href='" + data.data[i].link +
"'><img src='" + data.data[i].images.low_resolution.url +"' width='" + maxWidth + "' /></img></a></div>");
			}			
		}
    });

[vwphillips]

	for (var max,ary=[200,300],i = 0; i < 10; i++) {
     max=ary[Math.floor(Math.random()*ary.length)];
     alert(max);
    }