var cursize = 14;

function ajaxpage(pageurl, containerid) {
  var myAjax = new Ajax(pageurl, {method: 'get', 
  	                    update: $(containerid),
	                      evalScripts: true,
	                      onComplete: function() { 
	                      	new Fx.Style('content', 'font-size').set(cursize);
	                      	}
	                      }).request();
}

function fontSize(size) {
	cursize = size;
  var myFx = new Fx.Style('content', 'font-size', {duration:500}).start(size);
}