// Cookie functions

function setCookie(c_name,value,expiredays)
{
	var exdate=new Date();
	exdate.setDate(expiredays);
	document.cookie=c_name+ "=" +escape(value)+((expiredays==null) ? "" : ";expires="+exdate);
}

function getCookie(c_name)
{
	if (document.cookie.length>0)
	{
		c_start=document.cookie.indexOf(c_name + "=");
		if (c_start!=-1)
		{ 
			c_start=c_start + c_name.length+1 ;
			c_end=document.cookie.indexOf(";",c_start);
			if (c_end==-1) c_end=document.cookie.length;
			return unescape(document.cookie.substring(c_start,c_end));
		} 
	}
	return null;
}

function delCookie (NameOfCookie){ 
	if (getCookie(NameOfCookie)) {	
		document.cookie = NameOfCookie + "=" + "; expires=Thu, 01-Jan-70 00:00:01 GMT";
	}
}

/* can use this function to check if a particular cookie exists, and if it doesn't you can create a default cookie  */
function checkCookie(cookieName,defaultValue)
{
	var theCookie=getCookie(cookieName);
	if (theCookie==null)
	{
		setCookie(cookieName,defaultValue,365);
	}
}