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" : "");
}

function DeleteCookie(name) {  
	var exp = new Date();  
	exp.setTime (exp.getTime() - 1);  
	var cval = GetCookie (name);  
	document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
}

function DeleteAllCookies() {
//var iter = 0;
//alert('here\'s the cookie line, for one thing: ' + document.cookie);
	for (var nBegin = 0; nBegin != -1 && nBegin < document.cookie.length;iter++) {
		var sCookieName = document.cookie.substr(nBegin, document.cookie.indexOf('=', nBegin));
		//alert('here\'s one: ' + sCookieName);
		DeleteCookie(sCookieName);
		nBegin = document.cookie.indexOf(' ', nBegin) + 1;
//if (iter > 10000) {alert('infinite loop in DeleteAllCookies() function\n10000 iterations performed');break;}
	}
	alert('and we\'re done');
}