service = function (id,_top,_left){
var me = id.charAt?document.getElementById(id):id,d1 = document.body,d2 = document.documentElement;
d1.style.height = d2.style.height='100%';
me.style.top = _top?_top + 'px':0;
me.style[(_left>0?'left':'right')] = _left?Math.abs(_left)+'px':0;
me.style.position='absolute';
setInterval(function (){me.style.top = parseInt(me.style.top) + (Math.max(d1.scrollTop,d2.scrollTop) + _top - parseInt(me.style.top))*0.1 + 'px';},10 + parseInt(Math.random() * 20));
return arguments.callee;
};
window.onload=function (){service('msg',350,1)}