/* define image width and height */

var pic_width=160;
var pic_height=120;

/* define image urls */

if (document.images)
 {
     pic1= new Image(pic_width,pic_height);
     pic1.src="../images/DER/01.gif";  
     pic2= new Image(pic_width,pic_height); 
     pic2.src="../images/DER/02.gif"; 
     pic3= new Image(pic_width,pic_height);
     pic3.src="../images/DER/03.gif";  
     pic4= new Image(pic_width,pic_height);
     pic4.src="../images/DER/04.gif";  
     pic5= new Image(pic_width,pic_height);
     pic5.src="../images/DER/05.gif"; 
     pic6= new Image(pic_width,pic_height);
     pic6.src="../images/DER/06.gif";  
     pic7= new Image(pic_width,pic_height);
     pic7.src="../images/DER/07.gif"; 
     
 }    

/* define text for image captions  */

var pics= new Array(5) 
   pics[0]=pic1.src;
   pics[1]=pic2.src;
   pics[2]=pic3.src;
   pics[3]=pic4.src;
   pics[4]=pic5.src; 
   pics[5]=pic3.src;
   pics[6]=pic4.src;
   pics[7]=pic5.src; 


var numpics=7;
var thenum=0;
imgName="img1";

function change_it()
 {
   if (document.images)
    {
      document.write("<img src='"+pics[thenum]+"' border='0' width='"+pic_width+"' height='"+pic_height+"' name='img1'>\n");
      setTimeout('change_it2()',2000);  
   }
}

function change_it2()
{
  var x=0;
  thenum+=1;

  if (thenum>numpics-1)
    thenum=0;

  document[imgName].src=pics[thenum];
  x+=1;
  setTimeout('change_it2()',2000);
}