/**
 *
 * JS library for cookie handling
 */





/**
 * 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) {


	//alert("name: "+name+
		//" value: "+value+
		//" expires: "+((expires!=null) ? "; expires=" + expires : "")+
		//" path: "+((path!=null) ? "; path=" + path : "")+
		//" domain: "+((domain!=null) ? "; domain=" + domain : "")+
		//" secure: "+((secure!=null) ? "; secure" : ""));

    document.cookie= name + "=" + value +
        ((expires!=null) ? "; expires=" + expires.toGMTString() : "") +
        ((path!=null) ? "; path=" + path : "") +
        ((domain!=null) ? "; domain=" + domain : "") +
        ((secure!=null) ? "; 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) {
    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);
}


    /**
     * returns value in argument cookie, matchung argument key, in a 
     * cookie formatted like key1&value1&key2&value2...
     */
    function getValue(key, cookie) {


    	if(cookie==null || cookie.length==0) {
      		return null;
    	}

    	var dataArray=cookie.split("&");
    	for(var i=0;i<dataArray.length;i++) {
  			if(dataArray[i]==key) {
         		return dataArray[i+1];
       		}
    	}
    }

    /**
     * returns true if argument key is present in argument cookie, false otherwise
     */
    function isPresent(key, cookie) {

        var status=false;

    	if(cookie!=null && cookie.length>0) {
    		var dataArray=cookie.split("&");
    		for(var i=0;i<dataArray.length;i++) {
  				if(dataArray[i]==key) {
         			status=true;
         			break;
       			}
    		}
    	}
    	
    	return status;
    }


/**
 * 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";
    }
}