$(document).ajaxSend(function(event, request, settings) {
				    if ( settings.type == 'post' ) {
				        settings.data = (settings.data ? settings.data + "&" : "")
				                + "authenticity_token=" + encodeURIComponent( AUTH_TOKEN );
				        request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
				    }
				});

				// When I say html I really mean script for rails
				$.ajaxSettings.accepts.html = $.ajaxSettings.accepts.script;

				$.ajax({
				    data:'url_to_remote='+encodeURIComponent(URL), url: '/test/path/update_preview', type: 'post', dataType: 'html'
				});