// store an interval in a variable

var pause = 3000;

// create and initialize a counter                                    

var n = 0; 

// create an array of image file names                                         

var imgs = new Array ( "slideshow1.jpg","slideshow2.jpg","slideshow3.jpg","slideshow4.jpg","slideshow5.jpg","slideshow6.jpg","slideshow7.jpg","slideshow8.jpg","slideshow9.jpg","slideshow10.jpg","slideshow11.jpg","slideshow12.jpg","slideshow13.jpg","slideshow14.jpg","slideshow15.jpg","slideshow16.jpg","slideshow17.jpg","slideshow18.jpg","slideshow19.jpg","slideshow20.jpg","slideshow21.jpg","slideshow22.jpg","slideshow23.jpg","slideshow24.jpg","slideshow25.jpg","slideshow26.jpg","slideshow27.jpg","slideshow28.jpg","slideshow29.jpg","slideshow30.jpg","slideshow31.jpg","slideshow32.jpg","slideshow33.jpg","slideshow34.jpg","slideshow35.jpg","slideshow36.jpg","slideshow37.jpg","slideshow38.jpg","slideshow39.jpg");

// preload all the images

var preload = new Array();                             

for( var i = 1; i < imgs.length; i++ )
{                                            
  preload[i] = new Image();           
  preload[i].src = imgs[i];                                     
}

// a function to display each image for the set interval

function rotate()
{                       
  window.document.images.pic.src = imgs[n];                   
  ( n == (imgs.length - 1 )) ? n = 0 : n++;  
  window.setTimeout( "rotate()", pause );                              
}

// specify the onload event-handler

window.onload = rotate;