hole=new Array()
hole[0]="hole1"
hole[1]="hole2"
hole[2]="hole3"
hole[3]="hole4"
hole[4]="hole5"
hole[5]="hole6"
hole[6]="hole7"
hole[7]="hole8"
hole[8]="hole9"
hole[9]="hole10"
hole[10]="hole11"
hole[11]="hole12"
hole[12]="hole13"
hole[13]="hole14"
hole[14]="hole15"
hole[15]="hole16"
hole[16]="hole17"
hole[17]="hole18"

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

function toggle_visibility(id) {
   var e = document.getElementById(id);
   if(e.style.display == 'block')
      e.style.display = 'none';
   else
      e.style.display = 'block';
}