Hello,
How about a small function call , use jQuery .load() function (ofcurse this is in addition to adding the jQuery Js reference at the start :) ).
say you have the a Div having the "DivToLoadIn" id and you want to fill it with the contents of an HTMl File you have on the server say "HTMLPage.htm" the following will do it all :
$("#DivToLoadIn").load("HTMLPage.htm");
moreover if u just want the content of one specific element in that HTML page say the DIV "DivToGGetFrom" then
$("#DivToLoadIn").load("HTMLPage.htm #DivToGGetFrom");
check the jQuery site its so powerful.
hope this was of a value! , Good luck :)