function telchange()
{

var ys=document.mrf.member_phone_pre.value;
var yl=ys.length;

if(ys==1 || yl==2)
{
document.mrf.member_phone_post.focus();
}
}

function teldel(e)
{

if(e){ 
e = e
}
else {
e = window.event;
}

if(e.which){ 
var keycode = e.which 
}
else {
var keycode = e.keyCode 
}

if(keycode==8){ 
var zs=document.mrf.member_phone_post.value;
var zl=zs.length;
   if(zl==0){
document.mrf.member_phone_pre.focus();
   }
}
}