// determine browser 
var isPC = false
var isMac = false
var isIE = false
var isN6 = false 
var isN7 = false
var isN8 = false
var isOpera = false
var isSafari = false
var isFirefox = false
var isMozilla = false
var isDeterminedBrowser = false

function detect_browser() {
	var userAgent
	
	// determine browser version
	userAgent = navigator.userAgent

	isPC = (userAgent.indexOf("Windows") != -1)
	isMac = (userAgent.indexOf("Mac") != -1)
	
	isN6 = (userAgent.indexOf("Netscape6") != -1)
	isN7 = (userAgent.indexOf("Netscape/7") != -1)
	isN8 = (userAgent.indexOf("Netscape/8") != -1)
	isOpera = (userAgent.indexOf("Opera") != -1)
	isSafari = (userAgent.indexOf("Safari") != -1)
	isFirefox = (userAgent.indexOf("Firefox") != -1)
	isMozilla = (navigator.appName == "Netscape") && (!isFirefox) && (!isN6) && (!isN7) && (!isN8)
	isIE = (userAgent.indexOf("MSIE") != -1)
	// alert("zzz\n" + navigator.appCodeName + "\n" + navigator.appName + "\n" + navigator.appVersion + "\n" + navigator.platform + "\n" + navigator.userAgent)
  
   isDeterminedBrowser = true

  return
}

function get_element(elt_id) {
  var o_elt
	
	if (elt_id == "") return ""
	
	o_elt = document.getElementById(elt_id)
	if (!o_elt) o_elt = document.all[elt_id]
	
	return o_elt
}

function get_element_ex(elt_id, doc) {
  var o_elt
	
	if (!doc) return ""
	if (elt_id == "") return ""
	
	o_elt = doc.getElementById(elt_id)
	if (!o_elt) o_elt = doc.all[elt_id]
	
	return o_elt
}