var c = 2;

var image1 = new Image();
image1.src = "/images/a1.jpg";
var image2 = new Image();
image2.src = "/images/a2.jpg";

function disp_img(w)
   {
   if (c == 3)
      {
      c = 1;
      }
   var img_src = "/images/a" + c + ".jpg";
  // document.ani.src = img_src;
document.getElementById('intro').style.backgroundImage = "url("+img_src+")";
   c++;
   }
//t = setInterval("disp_img(c)", 1000);


function disp_arrow() {
        setai(c);
        document.getElementById('imglamp1').style.visibility='hidden';  
        document.getElementById('imglamp2').style.visibility='hidden';  
        document.getElementById('imglamp3').style.visibility='hidden';  
         document.getElementById('imglamp4').style.visibility='hidden';  
        document.getElementById('imglamp5').style.visibility='hidden'; 
        document.getElementById('imglamp6').style.visibility='hidden'; 
        document.getElementById('imglamp7').style.visibility='hidden'; 

        if ( c == 1 ) document.getElementById('imglamp1').style.visibility='visible';  
        if ( c == 2 ) document.getElementById('imglamp2').style.visibility='visible'; 
        if ( c == 3 ) document.getElementById('imglamp3').style.visibility='visible'; 
        if ( c == 4 ) document.getElementById('imglamp4').style.visibility='visible';
        if ( c == 5 ) document.getElementById('imglamp5').style.visibility='visible'; 
        if ( c == 6 ) document.getElementById('imglamp6').style.visibility='visible'; 
        if ( c == 7 ) document.getElementById('imglamp7').style.visibility='visible';

        c++;
        if ( c == 8 ) c=1;
}

t = setInterval("disp_arrow()", 1400);