function getCookie (name){
  var cookie=name +"=";
  var dc = eval("document.cookie")
  if (dc.length>0){
    begin = dc.indexOf(cookie);
    if(begin!=-1){
      begin += cookie.length;
      end = dc.indexOf(";",begin);
    if(end==-1)end=dc.length;
    return unescape(dc.substring(begin,end))
    }
  }
return null;
}

function setCookie (name,value){
  document.cookie=name+"="+escape(value);
}

var bgNum;
var bgNumMax=3;
if(getCookie('bgPic')==null||getCookie('bgPic')>bgNumMax){
  bgNum=1
  }
else{
  bgNum=getCookie('bgPic')
  }
document.write('<img src="images/home_language'+bgNum+'.jpg" width="910" height="760" border="0" usemap="#Map" />');
setCookie('bgPic',++bgNum);