<select id = 'teamSelect'>....options....</select>
<div id = 'tableContainer'></div>

$(function() {
    $("#teamSelect").bind("change", function() {
        $.ajax({
            type: "GET", 
            url: "path/to/server/script.php",
            data: "tid="+$("#teamSelect").val(),
            success: function(html) {
                $("#tableContainer").html(html);
            }
        });
    });

});