Simulando pseudo-class :last-child no Internet Explorer
/* Para Browsers Modernos */
.item:last-child {
border-right: 0px;
margin-right: 0px;
}
/* Para os Internet Explorers */
.item {
*border-right: expression(this.nextSibling == null ? '0px' : '1px solid #999');
*margin-right: expression(this.nextSibling == null ? '0px': '10px');
/* Caso use LESS: *margin-right: ~"expression(this.nextSibling == null ? '0px': '5px')"; */
}