/*var j=parseInt(Math.random()*12);
  j=(isNaN(j))?0:j; var j=parseInt(Math.random()*12);
  j=(isNaN(j))?0:j;*/

function writeSubImage(){
  list = new Array();
  list[list.length]='images/subphoto_kid1.jpg';
  list[list.length]='images/subphoto_kid2.jpg';
  list[list.length]='images/subphoto_kid3.jpg';
  list[list.length]='images/subphoto_class1.jpg';
  list[list.length]='images/subphoto_class2.jpg';
  list[list.length]='images/subphoto_class3.jpg';
  list[list.length]='images/subphoto_class4.jpg';
  list[list.length]='images/subphoto_class5.jpg';
  list[list.length]='images/subphoto_adultclass.jpg';

   var j=parseInt(Math.random()*list.length);
  j=(isNaN(j))?0:j; 
  
  document.write("<img src='"+list[j]+"'>");
}