With a little bit more of internet surfing, I was able to resize and center the popup window. However, the contents inside of it now look all mangled and pushed to the left (looks like there are forced margins). Is there a way to preserve or auto fit the contents to the popup window?
var width = 500;
var height = 300;
var left = parseInt((screen.availWidth/2) - (width/2));
var top = parseInt((screen.availHeight/2) - (height/2));
var windowFeatures = "width=" + width + ",height=" + height + ",status,resizable,left=" + left + ",top=" + top + "screenX=" + left + ",screenY=" + top;
myWindow = window.open('', '', windowFeatures).document.write(html)