$(document).ready(function(){
    lastBlock = $("#a1");
    maxWidth = 400;
    minWidth = 65;

    $("#accordian ul li a").hover(
    function(){
    $(lastBlock).animate({width: minWidth+"px"}, { queue:false, duration:400 });
    $(this).animate({width: maxWidth+"px"}, { queue:false, duration:400});
    lastBlock = this;
    }, function() {
    // empty function for 'hover-out' to prevent errors in IE
    });

});