var pic11 = new Image(); pic11.src = "pic11.jpg"
var pic12 = new Image(); pic12.src = "pic12.jpg"
var pic13 = new Image(); pic13.src = "pic13.jpg"


var flashDelay = 3000;

function FlashPicture()
{
  if( document.images["pic"].src == pic11.src )
    document.images["pic"].src=pic12.src;    
  else if( document.images["pic"].src == pic12.src )
    document.images["pic"].src=pic13.src;
                   
  else
    document.images["pic"].src=pic11.src;    

  setTimeout( "FlashPicture()", flashDelay );
};