//Declare function for setting cookie values. Expiration date is optional

function setCookie(name, value, expire) {

    document.cookie = name + "=" + escape(value)

    + ((expire == null) ? "" : ("; expires=" + expire.toGMTString()))

}



//Declare function for getting values from cookie

function getCookie(Name) {

    var search = Name + "="

    if (document.cookie.length > 0) { // if there are any cookies

        offset = document.cookie.indexOf(search) 

        if (offset != -1) { // if cookie exists 

            offset += search.length // set index of beginning of value

            // set index of end of cookie value

            end = document.cookie.indexOf(";", offset) 

            if (end == -1) { end = document.cookie.length }

            return unescape(document.cookie.substring(offset, end))

        } 

    }

}



//Declare function to return random number from 0 to maxNum

function randomNum(maxNum) {

	return Math.round((maxNum * Math.random()))

}



//get name of last node from cookie

if (getCookie("LastNode") != null) {

	lastNode = getCookie("LastNode")

} else {

	lastNode = ""

}



//get current node name and store in cookie

offset = location.pathname.lastIndexOf("/") + 1

end = location.pathname.lastIndexOf(".")

currentNode = location.pathname.substring(offset, end)

setCookie("LastNode", currentNode)



//Clear the contents of the top frame

parent.topFrame.location = "blank.htm"