a = new Image();a.src = "slide/sl_1.jpg";
   b = new Image();b.src = "slide/sl_2.jpg";
  
   function startSlideShow(){setTimeout("pic1()",3000);}
   function pic1(){document.images.slidepix.src="slide/sl_1.jpg";
    setTimeout("pic2()",9000);}
   function pic2(){document.images.slidepix.src="slide/sl_2.jpg";
    setTimeout("pic1()",15000);}