//Code from http://techpatterns.com/downloads/javascript_cookies.php

function Set_Cookie(name, value, expiry_days, path, domain, secure)
{
	// set time, it's in milliseconds
	var today = new Date();
	today.setTime( today.getTime() );

	if (expiry_days)
		expiry_days = expiry_days * 1000 * 60 * 60 * 24;
	
	var expires_date = new Date( today.getTime() + (expiry_days) );

	document.cookie = name + "=" +escape(value) +
		((expiry_days) ? ";expires=" + expires_date.toGMTString() : "") +
		((path) ? ";path=" + path : "") +
		((domain) ? ";domain=" + domain : "") +
		((secure) ? ";secure" : "");
}

function Get_Cookie(check_name) {
	// first we'll split this cookie up into name/value pairs
	// note: document.cookie only returns name=value, not the other components
	var a_all_cookies = document.cookie.split( ';' );
	var a_temp_cookie = '';
	var cookie_name = '';
	var cookie_value = '';
	var b_cookie_found = false; // set boolean t/f default f

	for (i = 0; i < a_all_cookies.length; i++){
		// now we'll split apart each name=value pair
		a_temp_cookie = a_all_cookies[i].split( '=' );

		// and trim left/right whitespace while we're at it
		cookie_name = a_temp_cookie[0].replace(/^\s+|\s+$/g, '');

		// if the extracted name matches passed check_name
		if (cookie_name == check_name){
			b_cookie_found = true;
			// we need to handle case where cookie has no value but exists (no = sign, that is):
			if (a_temp_cookie.length > 1)
				cookie_value = unescape(a_temp_cookie[1].replace(/^\s+|\s+$/g, ''));
				
			// note that in cases where cookie is initialized but no value, null is returned
			return cookie_value;
			break;
		}
		a_temp_cookie = null;
		cookie_name = '';
	}
	if (!b_cookie_found)
		return null;
}

// this deletes the cookie when called
function Delete_Cookie(name, path, domain) {
	if (Get_Cookie(name)) 
		document.cookie = name + "=" +
			((path) ? ";path=" + path : "") +
			((domain) ? ";domain=" + domain : "") +
			";expires=Thu, 01-Jan-1970 00:00:01 GMT";
}