/*==============================================================================    
Routines written by John Gardner - 2003 - 2005    
See www.braemoor.co.uk/software for information about more freeware available.
================================================================================

Routine to write a session cookie    
	Parameters:     cookieName        Cookie name        
			        cookieValue       Cookie Value        

	Return value:  
			        true              Session cookie written successfullly        
			        false             Failed - persistent cookies are not enabled   

	e.g. if (writeSessionCookie("pans","drizzle") then           
		alert ("Session cookie written");        	     
	     else           
		alert ("Sorry - Session cookies not enabled");
*/

function writeSessionCookie (cookieName, cookieValue) {  

	if (testSessionCookie()) {    
		document.cookie = escape(cookieName) + "=" + escape(cookieValue) + ";path=/";    
		return true;  
	} else 
		return false;
}

/*==============================================================================
Routine to get the current value of a cookie    
	Parameters:     cookieName      Cookie name        
	Return value:        
			        false	        Failed - no such cookie        
			        value           Value of the retrieved cookie   

	e.g. if (!getCookieValue("pans") then  		
		{           cookieValue = getCoookieValue ("pans2);        
		}
*/

function getCookieValue (cookieName) {  
	var exp = new RegExp (escape(cookieName) + "=([^;]+)");  
	
	if (exp.test(document.cookie + ";")) {    
		exp.exec (document.cookie + ";");    
		return unescape(RegExp.$1);  
	} else 
		return false;
}

/*==============================================================================
Routine to see if session cookies are enabled    
	Parameters:        None        
	Return value:        
		true              Session cookies are enabled        
		false             Session cookies are not enabled   

	e.g. if (testSessionCookie())           
		alert ("Session coookies are enabled");        
	     else           
		alert ("Session coookies are not enabled");*/

function testSessionCookie () {  
	document.cookie ="testSessionCookie=Enabled";  
	if (getCookieValue ("testSessionCookie")=="Enabled")    
		return true   
	else    
		return false;
}

/*==============================================================================
Routine to see of persistent cookies are allowed:    
	Parameters:        None        
	Return value:        
		true    Session cookies are enabled        
		false	Session cookies are not enabled  
		 
e.g. if (testPersistentCookie()) then           
		alert ("Persistent coookies are enabled");       
     else           
		alert ("Persistent coookies are not enabled");*/

function testPersistentCookie () {  

	writePersistentCookie ("testPersistentCookie", "Enabled", "minutes", 1);  

	if (getCookieValue ("testPersistentCookie")=="Enabled")    
		return true    
	else    
		return false;
}

/*==============================================================================
Routine to write a persistent cookie    
	Parameters:     CookieName      Cookie name        
			        CookieValue     Cookie Value        
			        periodType	    "years","months","days","hours", "minutes"        
			        offset          Number of units specified in periodType 
			       
	Return value:        
			        true            Persistent cookie written successfullly        
			        false           Failed - persistent cookies are not enabled        

	e.g. writePersistentCookie ("Session", id, "years", 1);
*/ 

function writePersistentCookie (CookieName, CookieValue, periodType, offset) 
{  	var expireDate = new Date ();  
	offset = offset / 1;    
	var myPeriodType = periodType; 
	 
	switch (myPeriodType.toLowerCase()) {    
	case "years":      		
	    expireDate.setYear(expireDate.getFullYear()+offset);      
		break;    
	case "months":
		expireDate.setMonth(expireDate.getMonth()+offset);      
		break;    
	case "days":      		
	    expireDate.setDate(expireDate.getDate()+offset);      
		break;    
	case "hours":      		
	    expireDate.setHours(expireDate.getHours()+offset);      
		break;    
	case "minutes":      		
	    expireDate.setMinutes(expireDate.getMinutes()+offset);      
		break;    
	default:      
		alert ("Invalid periodType parameter for writePersistentCookie()");      
		break;  
	}
     
	document.cookie = escape(CookieName ) + "=" + escape(CookieValue) + ";expires=" + expireDate.toGMTString() + ";path=/";
} 

 /*==============================================================================
Routine to delete a persistent cookie    	
	Parameters:     CookieName        Cookie name        
	Return value:        
			        true              Persistent cookie marked for deletion        

	e.g. deleteCookie ("Session");
*/

function deleteCookie (cookieName) {  
	if (getCookieValue (cookieName)) 
		writePersistentCookie (cookieName,"Pending delete","years", -1);    
		return true;     
}