function get_random()
{
    var ranNum= Math.floor(Math.random()*4);
    return ranNum;
}


function checkCookie() {
   // cookie doesn't exist
   if (readCookie('chsImage') == null) {

     var whichImage=get_random();
     var image=new Array(5);
     image[0]="interior1.jpg";
     image[1]="interior2.jpg";
     image[2]="interior3.jpg";

     var path = 'http://chs.clientapp2.com/images/interiorImages';
     var imagePath = path+'/'+image[whichImage];


// alert('cookie was not found, so we are randomly selecting image, '+image[whichImage]);
  var image_new = window.document.getElementById('image');
  image_new.src = imagePath;

     // create a cookie with the image path
     createCookie('chsImage', image[whichImage], 0);
   }
   // cookie's there
   else {
  var image = readCookie('chsImage');
  var path = 'http://chs.clientapp2.com/images/interiorImages';
  var imagePath = path+'/'+image;

//  alert('cookie was found with value , '+imagePath);
  var image_new = window.document.getElementById('image');
  image_new.src = imagePath;
//  document.write("<img src="http://chs.clientapp2.com/"+imagePath+"\">");
   }
}

function createCookie(name,value,days) {
if (days) {
var date = new Date();
date.setTime(date.getTime()+(days*24*60*60*1000));
var expires = "; expires="+date.toGMTString();
}
else var expires = "";
document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
var nameEQ = name + "=";
var ca = document.cookie.split(';');
for(var i=0;i < ca.length;i++) {
var c = ca[i];
while (c.charAt(0)==' ') c = c.substring(1,c.length);
if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
}
return null;
}

function eraseCookie(name) {
createCookie(name,"",-1);
}