the problem is that there are two domains involved.
you cannot use ajax to grab a page from any domain except the current one in the location bar.
if you could get it to spit out JSON instead of just text, you could use the data from anywhere.
but it sounds like you can't modify the camera's server at all.
BROWSER STATS [% share]
(2013/10/31) IE7:0.5, IE8:8.6, IE9:5.3, IE10:12.3, FF:17.7, CH:41.8, SF:8.1, MOBILE:20.4