$(function() {
$(window).scroll(function(){
var scrollTop = $(window).scrollTop();
if(scrollTop != 0)
$('#telephone').stop().animate({'opacity':'0.4'},2000);
else
$('#telephone').stop().animate({'opacity':'1'},400);
});

$('#telephone').hover(
function (e) {
var scrollTop = $(window).scrollTop();
if(scrollTop != 0){
$('#telephone').stop().animate({'opacity':'1'},400);
}
},
function (e) {
var scrollTop = $(window).scrollTop();
if(scrollTop != 0){
$('#telephone').stop().animate({'opacity':'0.4'},2000);
}
}
);
});