if (document.images) {

joinbuttonOn = new image;
joinbuttonOff = new image;
buttry2On = new image;
buttry2Off = new image;
adultbuttonOff = new image;
adultbuttonOn = new image;
bigadultbuttonOff = new image;
bigadultbuttonOn = new image;


joinbuttonOn.src = "images/joinbuttonOn.png";
joinbuttonOff.src = "images/joinbuttonOff.png";
buttry2On.src = "images/buttry2On.png";
buttry2Off.src = "images/buttry2Off.png";

adultbuttonOff.src = "images/adultbuttonOff.png";
adultbuttonOn.src = "images/adultbuttonOn.png";
bigadultbuttonOff.src = "images/bigadultbuttonOff.png";
bigadultbuttonOn.src = "images/bigadultbuttonOn.png";

}

function chgImg(imgField,imgState) {
   document[imgField].src = "images/" + imgField + imgState + ".png"
   }