function getCookie (name) {
var dcookie = document.cookie;
var cname = name + "=";
var clen = dcookie.length;
var cbegin = 0;
        while (cbegin < clen) {
        var vbegin = cbegin + cname.length;
                if (dcookie.substring(cbegin, vbegin) == cname) {
                var vend = dcookie.indexOf (";", vbegin);
                        if (vend == -1) vend = clen;
                return unescape(dcookie.substring(vbegin, vend));
                }
        cbegin = dcookie.indexOf(" ", cbegin) + 1;
                if (cbegin == 0) break;
        }
return null;
}

function setCookie (name, value, expires) {
  if (expires == "session")
   { document.cookie = name + "=" + escape (value); }
  else 
  { document.cookie = name + "=" + escape (value) + "; expires=" + expires.toGMTString() +  "; path=/"; } 
}

function delCookie (name) {
var expireNow = new Date();
document.cookie = name + "=" +
"; expires=Thu, 01-Jan-70 00:00:01 GMT" +  "; path=/";
}

var now = new Date();
var expire = new Date("July 20,2002");
if(now < expire)
 { if(getCookie("wchs") == null)
      { setCookie("wchs", "rabies", expire);
        window.open('popup.html','','height=300,width=300,resizable=yes');
      }
 }
 else
 {
   delCookie("wchs");
 }