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function vbscroll(mode, scrollStep, count) {
var w = window,
d = document,
x = y = 0,
ph = w.innerHeight,
c = count||1,
rel = true;
switch (mode) {
case 'j':
y = c * scrollStep;
break;
case 'h':
x = -c * scrollStep;
break;
case 'k':
y = -c * scrollStep;
break;
case 'l':
x = c * scrollStep;
break;
case 'd':
y = c * ph / 2;
break;
case 'u':
y = -c * ph / 2;
break;
case '\x06': /* ^F */
y = c * ph;
break;
case '\x02': /* ^B */
y = -c * ph;
break;
case 'G': /* fall through - gg and G differ only in y value when no count is given */
case 'g':
x = w.scrollX;
if (count) {
y = c * ((d.documentElement.scrollHeight - w.innerHeight) / 100);
} else {
y = 'G' == mode ? d.body.scrollHeight : 0;
}
rel = false;
break;
case '0':
y = w.scrollY;
rel = false;
break;
case '$':
x = d.body.scrollWidth;
y = w.scrollY;
rel = false;
break;
default:
return 1;
}
if (rel) {
w.scrollBy(x, y);
} else {
w.scroll(x, y);
}
return 0;
}
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