IE8 problem with slider (animate: true; orientation: vertical)

slider_filter_floor.slider({

range: true,

min: 0,

max: total - 1,

step: 1,

animate: true,

orientation: 'vertical',

slide: function(event, ui) { setFloorText(slider_filter_floor, ui); }

});

if orientation is set to vertical and animate to true then next line od code does not work in IE

slider_filter_floor.slider("values", 0, currentMin);

this method calls jquery animate method and e.cur() returns 0, so start is NaN. In FF e.cur() returns 1 and everything works ok.

animate: function( prop, speed, easing, callback ) {

...

jQuery.style( self, name, (end || 1) + unit);

start = ((end || 1) / e.cur()) * start;

jQuery.style( self, name, start + unit);

...