if (document.images) {
treatmentOn = new Image();
treatmentOn.src = "images/treatment_btn_roll.jpg";
treatmentOff = new Image();
treatmentOff.src = "images/treatment_btn.jpg";

aboutOn = new Image();
aboutOn.src = "images/about_us_btn_roll.jpg";
aboutOff = new Image();
aboutOff.src = "images/about_us_btn.jpg";

massageOn = new Image();
massageOn.src = "images/symptoms_btn_roll.jpg";
massageOff = new Image();
massageOff.src = "images/symptoms_btn.jpg";

injuryOn = new Image();
injuryOn.src = "images/injury_btn_roll.jpg";
injuryOff = new Image();
injuryOff.src = "images/injury_btn.jpg";

testimonialsOn = new Image();
testimonialsOn.src = "images/testimonial_btn_roll.jpg";
testimonialsOff = new Image();
testimonialsOff.src = "images/testimonial_btn.jpg";

blogOn = new Image();
blogOn.src = "images/blog_btn_roll.jpg";
blogOff = new Image();
blogOff.src = "images/blog_btn.jpg";
}


function activate(image_name) {
if (document.images) {
document[image_name].src = eval(image_name + "On.src");
}
}
function deactivate(image_name) {
if (document.images) {
document[image_name].src = eval(image_name + "Off.src");
}
}