states=new Array()
states[0]="1"
states[1]="2"
states[2]="3"
states[3]="4"
states[4]="5"
states[5]="6"
states[6]="7"
states[7]="8"
states[8]="9"
states[9]="10"
states[10]="11"
states[11]="12"
states[12]="13"
states[13]="14"
states[14]="15"
states[15]="16"
states[16]="17"
states[17]="18"
states[18]="19"

function hideallexcept(elm) {
for (var i = 0; i < states.length; i++) {
var layer = document.getElementById(states[i]);
if (elm!= states[i]) {
layer.style.display = "none";
}
else {
layer.style.display = "block";
}
}
}