$(document).ready(function() {
    $("button[name='21'],
    button[name='22'],
    button[name='23'],
    button[name='24'],
    button[name='25']").click(function(){
        var target = $(this).attr("name") - 20;
        $("#ID").prop("selectedIndex", target);
        FUNCTION();
    });
});

function ButtonTemplate(indx, menuID, fxn_to_run){
    $(document).ready(function() {
        $("button[name=" + "'" + toString(indx) + "'1']",
        "button[name=" + "'" + toString(indx) + "'2']",
        "button[name=" + "'" + toString(indx) + "'3']",
        "button[name=" + "'" + toString(indx) + "'4']",
        "button[name=" + "'" + toString(indx) +
"'5']").click(function(){
            var target = (this).attr("name") - (indx * 10);
            $(menuID).prop("selectedIndex", target);
            fxn_to_run;
        });
   });
}

ButtonTemplate(2, "#ID", FUNCTION());