/* define image width and height */

var pic_width=200;
var pic_height=200;

/* define image urls */

if (document.images)
 {
     pic1_ext= new Image(pic_width,pic_height);
     pic1_ext.src="images/ext_shutter.jpg";  
     pic2_ext= new Image(pic_width,pic_height); 
     pic2_ext.src="images/ext_pic1.jpg"; 
     pic3_ext= new Image(pic_width,pic_height);
     pic3_ext.src="images/ext_pic2.jpg";  
     pic4_ext= new Image(pic_width,pic_height);
     pic4_ext.src="images/ext_pic3.jpg";  
     pic5_ext= new Image(pic_width,pic_height);
     pic5_ext.src="images/ext_pic4.jpg"; 
     pic6_ext= new Image(pic_width,pic_height);
     pic6_ext.src="images/ext_pic5.jpg"; 
     pic7_ext= new Image(pic_width,pic_height);
     pic7_ext.src="images/ext_pic6.jpg"; 
     pic8_ext= new Image(pic_width,pic_height);
     pic8_ext.src="images/ext_pic7.jpg";
     pic9_ext= new Image(pic_width,pic_height);
     pic9_ext.src="images/ext_pic8.jpg"; 
     pic10_ext= new Image(pic_width,pic_height);
     pic10_ext.src="images/ext_pic9.jpg"; 
     pic11_ext= new Image(pic_width,pic_height);
     pic11_ext.src="images/ext_pic10.jpg"; 
     pic12_ext= new Image(pic_width,pic_height);
     pic12_ext.src="images/ext_pic11.jpg"; 
     pic13_ext= new Image(pic_width,pic_height);
     pic13_ext.src="images/ext_pic12.jpg"; 
}    
 
var pics_ext= new Array(12) 
   pics_ext[0]=pic1_ext.src;
   pics_ext[1]=pic2_ext.src;
   pics_ext[2]=pic3_ext.src;
   pics_ext[3]=pic4_ext.src;
   pics_ext[4]=pic5_ext.src;
   pics_ext[5]=pic6_ext.src;
   pics_ext[6]=pic7_ext.src;
   pics_ext[7]=pic8_ext.src;
   pics_ext[8]=pic9_ext.src;
   pics_ext[9]=pic10_ext.src;
   pics_ext[10]=pic11_ext.src;
   pics_ext[11]=pic12_ext.src;
   pics_ext[12]=pic13_ext.src;

var numpics=12;

var imgName_ext="img_ext";

function change_it_ext()
{
   if (document.images)
    {
      document.write("<IMG SRC='"+pics_ext[0]+"' border='0' width='"+pic_width+"' height='"+pic_height+"' name='img_ext'>\n");
    }
}

function change_it1_ext(thenum)
{
    document[imgName_ext].src=pics_ext[thenum];
}