Refreshing server side includes

I am currently using a STM32F4Discovery as a webserver and as I have little experience with web design I have run into a little problem...

I am wondering if it is possible to refresh my server side includes

!--#tag--

without refreshing the whole page using

meta http-equiv="refresh" content="x"

every x seconds? I tried using xmlhttp.open and xmlhttp.send which seems to work (my firmware responds and updates SSI values) but the values on the web page do not change.

Any help would be great, thanks!