var pause = 5000;
var n = 0;

var imgs = new Array("images/mex3.jpg", "images/ny4.jpg", "images/asia2.jpg", "images/euro1.jpg" );

// preload all the images

var preload = new Array();

for( var i = 0; i < imgs.length; i++ )
{
  preload[i] = new Image();
  preload[i].src = imgs[i];
}

// end preload

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