// add events
function addEvent(obj, evType, fn){ 
	 if (obj.addEventListener){ 
	   	obj.addEventListener(evType, fn, true); 
	   	return true; 
	 } else if (obj.attachEvent){ 
	   	var r = obj.attachEvent("on"+evType, fn); 
	   	return r; 
	 } else { 
	   	return false; 
	 } 
}
//replace a substring in a label
function replaceLabel( labelString, oldString, newString) {
	startPos=labelString.indexOf(oldString);
	if (startPos>-1) {
		endPos=startPos + oldString.length;
		firstPart=labelString.substring(0, startPos);
		lastPart=labelString.substring(endPos, labelString.length);
		return firstPart + newString + lastPart;
	} else {
		return labelString;
	}
}
// toggle visibility, toggle 'show' and 'hide' in label
function toggleDisplay( targetId,  labelId, displayType){
  if (document.getElementById){
  		target = document.getElementById( targetId );
		if (labelId) label = document.getElementById( labelId );
		show=true;
		if (target.style.display) { if (target.style.display != "none") { show=false; }}
		if (show) {
			target.style.display = displayType;
			if (labelId) label.innerHTML=replaceLabel(label.innerHTML, 'show', 'hide');
		} else {
			target.style.display = "none";
			if (labelId) label.innerHTML=replaceLabel(label.innerHTML, 'hide', 'show');
		}
  	}
}
// swap images
function newImage(arg) {
     if (document.images) {
          rslt = new Image();
          rslt.src = arg;
          return rslt;
     }
}
function changeImages() {
     if (document.images && (preloadFlag == true)) {
          for (var i=0; i<changeImages.arguments.length; i+=2) {
               document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
          }
     }
}
var preloadFlag = false;
function preloadImages() {
     if (document.images) {
        logoover = newImage("/i/nulay/logohomeo.gif");
		comingover = newImage("/i/nulay/glareon.gif");
        preloadFlag = true;
     }
}
// switch styles
function setActiveStyleSheet(title) {
  var i, a, main;
  for (i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if (a.getAttribute("rel") &&
        a.getAttribute("rel").indexOf("style") != -1 &&
        a.getAttribute("title")) {
      a.disabled = true;
      if(a.getAttribute("title") == title) a.disabled = false;
    }
  }
}
function getActiveStyleSheet() {
  var i, a;
  for (i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if (a.getAttribute("rel") &&
        a.getAttribute("rel").indexOf("style") != -1 &&
        a.getAttribute("title") &&
        !a.disabled
        ) return a.getAttribute("title");
  }
  return null;
}
function getPreferredStyleSheet() {
  var i, a;
  for (i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if (a.getAttribute("rel") &&
        a.getAttribute("rel").indexOf("style") != -1 &&
        a.getAttribute("rel").indexOf("alt") == -1 &&
        a.getAttribute("title")
        ) return a.getAttribute("title");
  }
  return null;
}
function createCookie(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
  }
  else expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}
function readCookie(name) {
  var nameEQ = name + "=";
  var ca = document.cookie.split(';');
  for(var i=0;i < ca.length;i++) {
    var c = ca[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
  }
  return null;
}
function openPopup(url, title) {
	var popupWin = window.open(url, title, 'menubar=no, toolbar=no, location=no, directories=no, status=no, scrollbars=yes, resizable=no, dependent, width=400, height=400, left=50, top=50');
}
window.onload = function(e) {
  var cookie = readCookie("style");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);
}
window.onunload = function(e) {
  var title = getActiveStyleSheet();
  createCookie("style", title, 365);
}
var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);