// JavaScript Document
function sc2(){
 document.getElementById("kefu").style.top=document.body.scrollTop+250;
 document.getElementById("kefu").style.left=document.body.scrollLeft+document.body.clientWidth-document.getElementById("kefu").offsetWidth;

}

function scall(){
sc2();
}
window.onscroll=scall;
window.onresize=scall;
window.onload=scall;