var
flag
=
false
;
//
mouse is clicked
var
moveValue
=
10
;
//
scroll threshold value
var
mouseY
=
0
;
//
Y coordinate
$(
function
(){
disableSelection(document.body);
$('body').bind(
'
mousedown
'
,
function
(event){
flag
=
true
;
}).bind(
'
mouseup
'
,
function
(event){
flag
=
false
;
}).bind(
'
mousemove
'
,
function
(event){
if
(
!
flag)
return
;
if
(
mouseY
<
event.clientY){
window.scrollTo(
0
, GetPageScroll().Y
+
moveValue
);
}
else
{
window.scrollTo(
0
, GetPageScroll().Y
-
moveValue
);
}
mouseY
=
event.clientY;
});
});
function
GetPageScroll() {
var
x, y;
if
(window.pageYOffset) {
//
all except IE
y
=
window.pageYOffset;
x
=
window.pageXOffset;
}
else
if
(document.documentElement
&&
document.documentElement.scrollTop) {
//
IE 6 Strict
y
=
document.documentElement.scrollTop;
x
=
document.documentElement.scrollLeft;
}
else
if
(document.body) {
//
all other IE
y
=
document.body.scrollTop;
x
=
document.body.scrollLeft;
}
return
{X:x, Y:y};
}
function
disableSelection(target){
if
(
typeof
target.onselectstart
!=
"
undefined
"
)
//
IE
target.onselectstart
=
function
(){
return
false
;}
else
if
(
typeof
target.style.MozUserSelect
!=
"
undefined
"
)
//
Firefox
target.style.MozUserSelect
=
"
none
"
;
else
//
All other ie: Opera
target.onmousedown
=
function
(){
return
false
}
target.style.cursor
=
"
default
"
}