var nPart = 0

function getElementbyClass(classname){
	arrPartscollect = new Array()
	var inc = 0
	var alltags = document.all ? document.all : document.getElementsByTagName("*")
	for (i = 0; i < alltags.length; i++){
		if (alltags[i].className == classname){
			alltags[i].style.display = "none"
			arrPartscollect[inc++] = alltags[i]
		}
	}
}

function cycleforward(){
	arrPartscollect[nPart].style.display="none"
	nPart = (nPart < arrPartscollect.length - 1 ) ? nPart+1 : 0
	arrPartscollect[nPart].style.display="block"
	updatenav()
	return false;
}

function cycleback(){
	arrPartscollect[nPart].style.display="none"
	nPart = (nPart > 0 ) ? nPart-1 : arrPartscollect.length - 1
	arrPartscollect[nPart].style.display="block"
	updatenav()
	return false;
}

function updatenav(){
	document.getElementById("backbutton").style.visibility = (nPart == 0) ? "hidden" : "visible"
	document.getElementById("forwardbutton").style.visibility = (nPart == arrPartscollect.length - 1 ) ? "hidden" : "visible"
}

function onloadfunct(){
	getElementbyClass("multiparts")
	arrPartscollect[0].style.display = "block"
	document.getElementById("formnavigation").style.display = "block"
	updatenav()
}

if (window.addEventListener){
	window.addEventListener("load", onloadfunct, false)
}
else if (window.attachEvent){
	window.attachEvent("onload", onloadfunct)
}
else if (document.getElementById){
	window.onload=onloadfunct
}