var j=parseInt(Math.random()*16);
  j=(isNaN(j))?0:j;

function writeSubImage(){
  list = new Array();
  list[list.length]="src='images/photo_sub1.jpg' alt=''";
  list[list.length]="src='images/photo_sub2.jpg' alt=''";
  list[list.length]="src='images/photo_sub3.jpg' alt=''";
  list[list.length]="src='images/photo_sub4.jpg' alt=''";
  list[list.length]="src='images/photo_sub5.jpg' alt=''";
  list[list.length]="src='images/photo_sub6.jpg' alt=''";
  list[list.length]="src='images/photo_sub7.jpg' alt=''";
  list[list.length]="src='images/photo_sub8.jpg' alt=''";
  list[list.length]="src='images/photo_sub9.jpg' alt=''";
  list[list.length]="src='images/photo_sub10.jpg' alt=''";
  list[list.length]="src='images/photo_sub11.jpg' alt=''";
  list[list.length]="src='images/photo_sub12.jpg' alt=''";
  list[list.length]="src='images/photo_sub13.jpg' alt=''";
  list[list.length]="src='images/photo_sub14.jpg' alt=''";
  list[list.length]="src='images/photo_sub15.jpg' alt=''";
  list[list.length]="src='images/photo_sub16.jpg' alt=''";
  document.write("<img "+list[j]+" width=350 height=365 >");
}