var picture = new Array();
picture[0] = 'vaopics/Olive.jpg';
picture[1] = 'vaopics/Grace.jpg';
picture[2] = 'vaopics/Workshop.jpg';
picture[3] = 'vaopics/Ruhan.jpg';
picture[4] = 'vaopics/vao01.jpg';
picture[5] = 'vaopics/vao02.jpg';
picture[6] = 'vaopics/vao03.jpg';
picture[7] = 'vaopics/vao04.jpg';
picture[8] = 'vaopics/vaogh2003_01.jpg';
picture[9] = 'vaopics/vaogh2003_02.jpg';
picture[10] = 'vaopics/vaogh2003_03.jpg';
picture[11] = 'vaopics/vaogh2003_04.jpg';
picture[12] = 'vaopics/vaogh2003_05.jpg';
picture[13] = 'vaopics/vaogh2003_06.jpg';
picture[14] = 'vaopics/vaosl2004_01.jpg';
picture[15] = 'vaopics/vaosl2004_02.jpg';
picture[16] = 'vaopics/vaosl2004_03.jpg';
imgs = new Array(17);
for (i=0;i<17;i++)
{
imgs[i] = new Image();
imgs[i].src=picture[i];
}
var picNumber=1
var numberofPics = picture.length
function previousPicture()
{
  if(picNumber > 1){
    picNumber--
    }
    document.buttons.next.disabled = false;
	  document.myPicture.src=picture[picNumber-1];
  if (picNumber == 1) 
  {
	 document.buttons.prev.disabled=true;
  }
}
function nextPicture()
{
  if(picNumber < numberofPics){
     picNumber++
     }
   document.buttons.prev.disabled = false;
   document.myPicture.src=picture[picNumber-1];
   if(picNumber == numberofPics) 
  {
    document.buttons.next.disabled = true;	
  } 
}