תעזרו לי

window.addEvent('load', function() {
var rAF = window.mozRequestAnimationFrame ||
          window.webkitRequestAnimationFrame;
var f = document.getElementById('foo');
var b = document.getElementById('bubbleChat');
var el = document.getElementById('avatarChat');
el.addEventListener('mousedown', function(ev){
    rAF(function() {
        f.style.left = (ev.clientX-23)+'px';
        f.style.top = (ev.clientY-23)+'px';
        f.class = 'top: '+(ev.clientY-23)+'px; left: '+(ev.clientX-23)+'px; ';
        b.value = 'top: '+(ev.clientY-23)+'px; left: '+(ev.clientX-23)+'px;';
    });
},false);
});//]]>