var i, imgs, pic;

function rotate()
{
  pic.src = imgs[i] ;
  (i === (imgs.length -1) ) ? i=0 : i++ ;
  setTimeout( rotate, 3500 ); 
}

function init()
{
  pic = document.getElementById("pic");
 
  imgs = [ "http://c21setup.com/c21grc/skyway.jpg", "http://c21setup.com/c21grc/skyway2.jpg","http://c21setup.com/c21grc/skyway_windsurf-sm.jpg", "http://c21setup.com/c21grc/skyway-drive-sm.jpg", "http://c21setup.com/c21grc/treasure-island.jpg","http://c21setup.com/c21grc/scenic-beach.jpg", "http://c21setup.com/c21grc/beach2sm.jpg", "http://c21setup.com/c21grc/beach-seats-sm.jpg", "http://c21setup.com/c21grc/beach-sail-sm.jpg"] ;

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

  i=0;

  rotate();
}
onload=init;