You could get the width of the view-port and the width of the content, then scale the content down based on a ratio of the two:

var venderPrefix = ($.browser.webkit)  ? 'Webkit' : 
                   ($.browser.mozilla) ? 'Moz' :
                   ($.browser.ms)      ? 'Ms' :
                   ($.browser.opera)   ? 'O' : '';
var ratio = $(window).width() / $('#newContent').width();
$('#newContent').css(venderPrefix + 'Transform', 'scale(' + ratio + ')');