jQuery and Plugins — AJAX calls

Hi,
I am developing a plugin and have a quick question…I first developed my plugin as an individual ‘webpage’ and am now integrating (wrapping) it into a WP plugin. It all functioned correctly before WP and almost functions correctly now but I have run into an interesting issue. Anyways, to my question…is there some sort of issue in using a jQuery .post() function from within the WP sidebar? I am trying to do this type of thing…

jQuery.post("php/draw_calendar.php", {month: currentMonth, year: currentYear - 2000, days: daysInMonth}, function(data){
  			jQuery("#Calender").html(data);
  			jQuery( "#eventDialog" ).dialog({ autoOpen: false, resizable: false, width: 300, minHeight: 200 });
			jQuery( "#eventDialog" ).bind( "dialogopen", function(event, ui) {});
		});

Everything in the jQuery works fine except that it seems that the data returned from the file is never added to the HTML. Any guidance here would be outstanding!

Thanks.