<!DOCTYPE html> <html> <head> <style> div { width:100px; height:100px; background:red; position:relative; } </style> <script type="text/javascript" src="js/jquery-1.7.2.min.js"></script> <script type="text/javascript"> $(function(){ var oldY= null; var isdown = false; $("#testcss").mousedown(function(e){ isdown = true; oldY = e.clientY; }); $("html").mousemove(function(e){ if(isdown){ $("#testcss").css("transform","rotate("+(e.clientY-oldY)+"deg)"); } }); $("html").mouseup(function(e){ isdown = false; oldY = null; }); }); </script> </head> <body> <div id="testcss"></div> </body> </html>