How fix (work with ff, ie7) problem in ie6:

function slide(){
$(function(){


var wdt = $('#bckg_photo').width();
var move = (2196 - wdt) * -1;

$('#bckg_photo').animate({backgroundPosition: '' + move + ', 0'}, {duration:4000}),
$('#bckg_photo').animate({backgroundPosition: '0, 0'}, {duration:4000})

});
}

setInterval("slide()", 50);


//CSS -style

#bckg_photo{
background:url(../background.jpg) 0 0;
height:600px;
}