var i=0;
var y;
var cont;
var b=20;
window.onload=function()
{
setTimeout("startslider1()", 2000);
}

function startslider1()
{

var ab1=document.getElementById("img1");
var ab2=document.getElementById("img2");
var ab3=document.getElementById("img3");
var ab4=document.getElementById("img4");

ab1.style.display="block";
ab2.style.display="none";
ab3.style.display="none";
ab4.style.display="none";

setTimeout("startslider2()", 2000);
}

function startslider2()
{

var ab1=document.getElementById("img1");
var ab2=document.getElementById("img2");
var ab3=document.getElementById("img3");
var ab4=document.getElementById("img4");

ab1.style.display="none";
ab2.style.display="block";
ab3.style.display="none";
ab4.style.display="none";

setTimeout("startslider3()", 2000);
}


function startslider3()
{

var ab1=document.getElementById("img1");
var ab2=document.getElementById("img2");
var ab3=document.getElementById("img3");
var ab4=document.getElementById("img4");

ab1.style.display="none";
ab2.style.display="none";
ab3.style.display="block";
ab4.style.display="none";

setTimeout("startslider4()", 2000);
}


function startslider4()
{

var ab1=document.getElementById("img1");
var ab2=document.getElementById("img2");
var ab3=document.getElementById("img3");
var ab4=document.getElementById("img4");

ab1.style.display="none";
ab2.style.display="none";
ab3.style.display="none";
ab4.style.display="block";

setTimeout("startslider1()", 2000);
}