var querystring=location.search.substring(1,location.search.length);

function readID() {

var expDays = 30; 

var expDate = new Date();

expDate.setTime(expDate.getTime() +  (24 * 60 * 60 * 1000 * expDays)); 

var id = GetCookie('id');

if (id == null || id == "no id") {

if (location.search.length > 1) id = location.search.substring(1, location.search.length);

else id = "no id";

if (id != GetCookie('id')) SetCookie('id', querystring, expDate,'/','pfieldwalker.com','true');

}


}

function getCookieVal (offset) {  

var endstr = document.cookie.indexOf (";", offset);  

if (endstr == -1)    

endstr = document.cookie.length;  

return unescape(document.cookie.substring(offset, endstr));

}

function GetCookie (name) {  

var arg = name + "=";  

var alen = arg.length;  

var clen = document.cookie.length;  

var i = 0;  

while (i < clen) {    

var j = i + alen;    

if (document.cookie.substring(i, j) == arg)      

return getCookieVal (j);    

i = document.cookie.indexOf(" ", i) + 1;    

if (i == 0) break;   

}  

return null;

}

function SetCookie (name, value) { 

var argv = SetCookie.arguments;  

var argc = SetCookie.arguments.length;  

var expires = (argc > 2) ? argv[2] : null;  

var path = (argc > 3) ? argv[3] : null;  

var domain = (argc > 4) ? argv[4] : null;  

var secure = (argc > 5) ? argv[5] : false;  

document.cookie = name + "=" + escape (value) + 

((expires == null) ? "" : ("; expires=" + expires.toGMTString())) + 

((path == null) ? "" : ("; path=" + path)) +  

((domain == null) ? "" : ("; domain=" + domain)) +    

((secure == true) ? "; secure" : "");

}