function fontResize() {
    //Set default resolution and font size
    var resolution = 1024;
    var font = 13;

    //Get window width
    var width = $(window).width();

    //Set new font size
    var newFont = font * (width/resolution);
    $('body').css('font-size', newFont);
};

$(document).ready(function()
     {       
         fontResize();
         $(window).bind('resize', function() {
             fontResize();
         });
     }
);

jQuery fontResize

resize, jquery

jQuery