var activex = ((navigator.userAgent.indexOf('Win')  != -1) && (navigator.userAgent.indexOf('MSIE') != -1) && (parseInt(navigator.appVersion) >= 4 ));
var CantDetect = ((navigator.userAgent.indexOf('Safari')  != -1) || (navigator.userAgent.indexOf('Opera')  != -1));

function oopsPopup() {
	 if((navigator.language && navigator.language.indexOf("ja") != -1) || (navigator.systemLanguage && navigator.systemLanguage.indexOf("ja") != -1) || (navigator.userLanguage && navigator.userLanguage.indexOf("ja") != -1)) {
		  var URLtoOpen = "http://download.skype.com/share/skypebuttons/oops/oops_ja.html";
	 } else {
		  var URLtoOpen = "http://download.skype.com/share/skypebuttons/oops/oops.html";
	 }
	var windowName = "oops";
	var popW = 540, popH = 305;
	var scrollB = 'no';
	w = screen.availWidth;
	h = screen.availHeight;
	var leftPos = (w-popW)/2, topPos = (h-popH)/2;
	oopswindow = window.open(URLtoOpen, windowName,'width=' + popW + ',height=' + popH + ',scrollbars=' + scrollB + ',screenx=' +leftPos +',screeny=' +topPos +',top=' +topPos +',left=' +leftPos);
	return false;
}

if(typeof(detected) == "undefined" && activex) {
	 document.write(
		  ['<script language="VBscript">',
		  'Function isSkypeInstalled()',
		  'on error resume next',
		  'Set oSkype = CreateObject("Skype.Detection")',
		  'isSkypeInstalled = IsObject(oSkype)',
		  'Set oSkype = nothing',
		  'End Function',
		  '</script>'].join("\n")
	 );
}

function skypeCheck() {
	 if(CantDetect) {
		  return true;
	 } else if(!activex) {
		  var skypeMime = navigator.mimeTypes["application/x-skype"];
		  detected = true;
		  if(typeof(skypeMime) == "object") {
				return true;
		  } else {
				return oopsPopup();
		  }
	 } else {
		  if(isSkypeInstalled()) {
				detected = true;
				return true;
		  }
	 }
	 
	 detected = true;
	 return oopsPopup();
}

function loadDetection() {
	 if(document.getElementById && document.getElementsByTagName) {
		  if (window.addEventListener) window.addEventListener('load', addDetection, false);
		  else if (window.attachEvent) window.attachEvent('onload', addDetection);
	 }
}

function addDetection() {
	 var pageLinks = document.getElementsByTagName("a");
	 for (var i=0; i < pageLinks.length; i++) {
		  if(pageLinks[i].childNodes[0] && pageLinks[i].childNodes[0].src) {
				if((pageLinks[i].childNodes[0].src.indexOf('download.skype.com\/share\/skypebuttons') != -1 || pageLinks[i].childNodes[0].src.indexOf('mystatus.skype.com') != -1) && (typeof(pageLinks[i].onclick) == "undefined" || pageLinks[i].onclick == null)) {
					 pageLinks[i].onclick = function sChk() { return skypeCheck(); }
				}
		  }
	 }
}

loadDetection();