function getQueryStringValue(key) {
	var query = window.location.search.substring(1);
	var vars = query.split("&");
	for (var i=0;i<vars.length;i++) {
		var pair = vars[i].split("=");
		if (pair[0] == key) {
			return pair[1];
		}
	} 
}

// Cookie functions.
function setCookie(name, value, expires) {
    document.cookie = name + "=" + escape(value) + "; path=/" + ((expires == null) ? "" : "; expires=" + expires.toUTCString());
}

function getCookie (name) {
    var dc = document.cookie;
    var cname = name + "=";

    if (dc.length > 0) {              
		begin = dc.indexOf(cname);       
		if (begin != -1) {           
			begin += cname.length;       
			end = dc.indexOf(";", begin);
			if (end == -1)
				end = dc.length;
			return unescape(dc.substring(begin, end));
		}
	}
	return null;
}

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