if (document.images)
{

btn1_on = new Image();
btn1_on.src = "images/btn_campozone_on.png";
btn1_off = new Image();
btn1_off.src = "images/btn_campozone_off.png";

btn2_on = new Image();
btn2_on.src = "images/btn_jrcamp_on.png";
btn2_off = new Image();
btn2_off.src = "images/btn_jrcamp_off.png";

btn3_on = new Image();
btn3_on.src = "images/btn_d2_on.png";
btn3_off = new Image();
btn3_off.src = "images/btn_d2_off.png";

btn4_on = new Image();
btn4_on.src = "images/btn_minicamp_on.png";
btn4_off = new Image();
btn4_off.src = "images/btn_minicamp_off.png";

btn5_on = new Image();
btn5_on.src = "images/btn_d1_on.png";
btn5_off = new Image();
btn5_off.src = "images/btn_d1_off.png";

btn6_on = new Image();
btn6_on.src = "images/btn_registernow_on.png";
btn6_off = new Image();
btn6_off.src = "images/btn_registernow_off.png";

btn7_on = new Image();
btn7_on.src = "images/btn_directions_on.png";
btn7_off = new Image();
btn7_off.src = "images/btn_directions_off.png";

btn8_on = new Image();
btn8_on.src = "images/btn_registernow2_on.png";
btn8_off = new Image();
btn8_off.src = "images/btn_registernow2_off.png";

btn9_on = new Image();
btn9_on.src = "images/btn_registerfeb2_on.png";
btn9_off = new Image();
btn9_off.src = "images/btn_registerfeb2_off.png";

}

 function rollOn(imgName)
 {
   if (document.images) {
    imgOn = eval(imgName + "_on.src");
    document [imgName].src = imgOn;
   }
 }

 function rollOff(imgName)
 {
   if (document.images) {
    imgOff = eval(imgName + "_off.src");
    document [imgName].src = imgOff;
   }
 }