$(document).ready(
function(){

var box1 = $("#box1");  
var box2 =$("#Div1");
var box3 = $("#Div2");
box2.hide();
box3.hide();
var imdiv = $("#ri8");

imdiv.css("background-image","url(images/4.jpg)"); 
}
);

function cha6()
{
var box1 = $("#box1");  
var box2 =$("#Div1");
var box3 = $("#Div2");

box1.hide();
box2.show();
box3.hide();
var imdiv = $("#ri6");

imdiv.css("background-image","url(images/6.jpg)"); 
var imdiv = $("#ri8");
imdiv.css("background-image","url(images/1.jpg)"); 
var imdiv = $("#ri7");
imdiv.css("background-image","url(images/2.jpg)");
}

function cha5()
{
var box1 = $("#box1");  
var box2 =$("#Div1");
var box3 = $("#Div2");

box1.hide();
box2.hide();
box3.show();
var imdiv = $("#ri7");
imdiv.css("background-image","url(images/5.jpg)"); 

var imdiv = $("#ri8");
imdiv.css("background-image","url(images/1.jpg)"); 
var imdiv = $("#ri6");

imdiv.css("background-image","url(images/3.jpg)"); 

}

function cha4()
{var box1 = $("#box1");  
var box2 =$("#Div1");
var box3 = $("#Div2");
box2.hide();
box3.hide();
box1.show();
var imdiv = $("#ri8");
imdiv.css("background-image","url(images/4.jpg)"); 
var imdiv = $("#ri6");

imdiv.css("background-image","url(images/3.jpg)"); 
var imdiv = $("#ri7");
imdiv.css("background-image","url(images/2.jpg)"); 

}


function Im7()
{
var imdiv = $("#ri8");
imdiv.css("background-image","url(images/1.jpg)"); 
var imdiv = $("#ri7");
imdiv.css("background-image","url(images/2.jpg)"); 

}
function Im8()
{
var imdiv = $("#ri8");
imdiv.css("background-image","url(images/1.jpg)"); 
var imdiv = $("#ri6");

imdiv.css("background-image","url(images/3.jpg)"); 
}

function Im9()
{
var imdiv = $("#ri6");

imdiv.css("background-image","url(images/3.jpg)"); 
var imdiv = $("#ri7");
imdiv.css("background-image","url(images/2.jpg)"); 
}