ui dialog modal in IE

ui dialog modal in IE


Is there some bug that ui modal dialog don't work in IE?
Tme dialog is modal in ff,sf,op,chrome but not in IE. Why?
code:
$('#bt<%=fp_rs("cod_casa")%><%=fp_rs("id")%>').click(function() {
    $('#prereserva<%=fp_rs("cod_casa")%><%=fp_rs("id")%>').load('/frtfc/
env_dd_dial.asp',
    {
    nm_mes: '<%=fp_rs("nm_mes")%>',
    cod_casa: '<%=fp_rs("cod_casa")%>',
    inicio: '<%=fp_rs("inicio")%>',
    fim: '<%=fp_rs("fim")%>',
    id: '<%=fp_rs("id")%>' ,
    n_semana : '<%=fp_rs("n_semana")%>' ,
    preco: '<%=fp_rs("preco")%>'
    }).dialog({modal: true, height: 500, width: 425,title: 'Reserva casa <
%=fp_rs("cod_casa")%> período <%=fp_rs("inicio")%> a <%=fp_rs("fim")
%>'
});
});