rem: z.timer = setInterval(function(){ z.step(from, to); }, 13); 
add: jQuery.timers.push(function(){ return z.step(from, to); });  if ( jQuery.timers.length == 1 ) { var timer = setInterval(function(){ var timers = jQuery.timers;  for ( var i = 0; i < timers.length; i++ ) if ( !timers[i]() ) timers.splice(i--, 1);  if ( !timers.length ) clearInterval( timer ); }, 13); } 
context: 		z.custom = function(from,to){			z.startTime = (new Date()).getTime();			z.now = from;			z.a();			z.timer = setInterval(function(){				z.step(from, to);			}, 13);		};
meta: 5982	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/5982/f29aa679d26dfc4f883868d041c506eaee4b6064/jquery.js/clean/static/scripts/jquery.js