I have created a script that sets a cookie, and also delets it. 
however i am having trouble when its delets the cookie it stills runs
on sub folders, so i have tried using domain setting but still not
functioning.

I have tried deleting b setting the cookie to - hours from this date/time.

Code is:
var cpath = "";   // path for which allowed [Optional]
var cdomain = "http://www.disabilityjobsite.co.uk"; // domain for
which allowed [Optional]


function getexpirydate(nohours){
var expiry;
// Set expiry Date to 1 hour from now
expiry.setTime((now.getTime() nohours*60*60*1000));
return expiry;
}
function getcookie(cookiename) {
 var cookiestring=""+document.cookie;
 var index1=cookiestring.indexOf(cookiename);
 if (index1==-1 || cookiename=="") return ""; 
 var index2=cookiestring.indexOf(';',index1);
 if (index2==-1) index2=cookiestring.length; 
 return unescape(cookiestring.substring(index1+cookiename.length+1,index2));
}

function setCookie(name, value, expires, path, domain, secure) { 
	var curCookie = name + '=' + escape(value) + 
	((expires) ? '; expires=' + getexpirydate(expires) : '') + 
	((path) ? '; path=' + cpath : '') + 
	((domain) ? '; domain=' + cdomain : '') + 
	((secure) ? '; secure' : '') 
	document.cookie = curCookie 
}


>>and calling function to delete and set are:

	if (sz > 0) {
		setCookie('fntsize',sz,1);
	}else{
		setCookie('fntsize',sz,-3000);
	}