var mycookie = document.cookie; 
function readcookie(name)
{
var start1 = mycookie.indexOf(name + "=");
if (start1== -1)
document.write("");
else
{
start=mycookie.indexOf("=",start1)+1; 
var end = mycookie.indexOf(";",start);
if (end==-1)
{
 end=mycookie.length;}
 var value=unescape(mycookie.substring(start,end));
 if (value==null)
 {alert("No cookies found!");}
 else
document.write(value);

 }
}
readcookie("b");