function random_demonum(){
  var demonums=new Array()
   demonums[1]="01"
   demonums[2]="02"
   demonums[3]="03"
   demonums[4]="04"
   demonums[5]="05"
   demonums[6]="06"
   demonums[7]="07"
   demonums[8]="08"
   demonums[9]="09"
  demonums[10]="10"
  demonums[11]="11"
  demonums[12]="12"
  demonums[13]="13"
  demonums[14]="14"
  demonums[15]="15"
  demonums[16]="16"
  demonums[17]="17"
  demonums[18]="18"
  demonums[19]="19"
  demonums[20]="20"
  demonums[21]="21"
  demonums[22]="22"
  demonums[23]="23"
  demonums[24]="24"
  demonums[25]="25"
  
  var ry=Math.floor(Math.random()*demonums.length);
  if (ry==0) ry=1;
    document.write('demo'+demonums[ry]);
}