if (document.images) {
    var graduate_up = new Image();
    graduate_up.src = "/images/graduate.gif";

    var graduate_over = new Image();
    graduate_over.src = "/images/graduate_over.gif";

    var employee_up = new Image();
    employee_up.src = "images/employee.gif";

    var employee_over = new Image();
    employee_over.src = "images/employee_over.gif";

    var counselor_up = new Image();
    counselor_up.src = "images/counselor.gif";

    var counselor_over = new Image();
    counselor_over.src = "images/counselor_over.gif";
}

function graduate_over_button() {
    if (document.images) {
        document.getElementById("graduateButton").src = graduate_over.src
    }
}

function graduate_up_button() {
    if (document.images) {
        document.getElementById("graduateButton").src = graduate_up.src
    }
}

function employee_over_button() {
    if (document.images) {
        document.getElementById("employeeButton").src = employee_over.src
    }
}

function employee_up_button() {
    if (document.images) {
        document.getElementById("employeeButton").src = employee_up.src
    }
}
function counselor_over_button() {
    if (document.images) {
        document.getElementById("counselorButton").src = counselor_over.src
    }
}

function counselor_up_button() {
    if (document.images) {
        document.getElementById("counselorButton").src = counselor_up.src
    }
}