// JavaScript Document
/**
 * Sets a Cookie with the given name and value.
 *
 * name       Name of the cookie
 * value      Value of the cookie
 * [expires]  Expiration date of the cookie (default: end of current session)
 * [path]     Path where the cookie is valid (default: path of calling document)
 * [domain]   Domain where the cookie is valid
 *              (default: domain of calling document)
 * [secure]   Boolean value indicating if the cookie transmission requires a
 *              secure transmission
 */
function setCookie(name, value, expires, path, domain, secure)
{
	var exdate=new Date();
	exdate.setDate(exdate.getDate()+expires);
    document.cookie= name +"="+ escape(value)+
        ((expires)?"; expires="+ exdate.toGMTString():"")+
        ((path)?"; path="+ path :"")+
        ((domain)?"; domain="+ domain :"")+
        ((secure)?"; secure":"");
}
/**
 * Gets the value of the specified cookie.
 *
 * name  Name of the desired cookie.
 *
 * Returns a string containing value of specified cookie,
 *   or null if cookie does not exist.
 function getCookie(name) {

	if (new RegExp("(?:^|;)"+name+"(?:$|=)([^;]+)").test(document.cookie)) {		
	return unescape(RegExp.$1);
	 } else {		
	 return '';
	}
}
 */
function getCookie(name)
{
    var dc = document.cookie;
    var prefix = name +"=";
    var begin = dc.indexOf("; "+ prefix);
    if(begin ==-1)
    {
        begin = dc.indexOf(prefix);
        if(begin !=0)return null;
    }
    else
    {
        begin +=2;
    }
    var end = document.cookie.indexOf(";", begin);
    if(end ==-1)
    {
        end = dc.length;
    }
    return dc.substring(begin + prefix.length, end);
}

/**
 * Deletes the specified cookie.
 *
 * name      name of the cookie
 * [path]    path of the cookie (must be same as path used to create cookie)
 * [domain]  domain of the cookie (must be same as domain used to create cookie)
 */
function deleteCookie(name, path, domain)
{
    if(getCookie(name))
    {
        document.cookie = name +"="+
            ((path)?"; path="+ path :"")+
            ((domain)?"; domain="+ domain :"")+
            "; expires=Thu, 01-Jan-70 00:00:01 GMT";
    }
}