var w3c = (document.getElementById) ? 1:0
var ns4 = (document.layers) ? 1:0  //browser detect for NS4 & W3C standards
var hasCookies = false;
  
//tests whether the user accepts cookies, and sets a flag.
//тестируем на поддержку куков, если "ДА", то в true
if(document.cookie == '') {
	document.cookie = 'hasCookies=yes';
	if (document.cookie.indexOf('hasCookies=yes') != -1) hasCookies = true;
}
else hasCookies = true;

//загрузка картинок
function preload() {
	MM_preloadImages('images/buttons/home_up.gif', 'images/buttons/employees_up.gif', 'images/buttons/clients_up.gif', 'images/buttons/projects_up.gif','images/buttons/tasks_up.gif','images/buttons/jobs_up.gif');
}

// sets a cookie in the browser.
//устанавливаем куку
function setCookie (name, value, hours, path) {
	if (hasCookies) {
		if(hours) {
			if ( (typeof(hours) == 'string') && Date.parse(hours) ) var numHours = hours;
			else if (typeof(hours) == 'number') var numHours = (new Date((new Date()).getTime() + hours*3600000)).toGMTString();
		}
		document.cookie = name + '=' + escape(value) + ((numHours)?(';expires=' + numHours):'') + ((path)?';path=' + path:'');
	}
}
 
// reads a cookie from the browser
//читаем куку
function readCookie(name) {
	if (document.cookie == '') return '';
	else {
		var firstChar, lastChar;
		var theBigCookie = document.cookie;
		firstChar = theBigCookie.indexOf(name);
		if (firstChar != -1) {
			firstChar += name.length + 1;
			lastChar = theBigCookie.indexOf(';', firstChar);
			if (lastChar == -1) lastChar = theBigCookie.length;
			return unescape(theBigCookie.substring(firstChar, lastChar));
		}
		else return '';
	}
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}
function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}
function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
function windowOpen(name, url, width, height, toolbar, menubar, statusbar, scrollbar, resizable) {
  var wint = (screen.height - height) / 2;
  var winl = (screen.width - width) / 2;
  toolbar_str = toolbar ? 'yes' : 'no';
  menubar_str = menubar ? 'yes' : 'no';
  statusbar_str = statusbar ? 'yes' : 'no';
  scrollbar_str = scrollbar ? 'yes' : 'no';
  resizable_str = resizable ? 'yes' : 'no';
  window.open(url, name, 'left='+winl+',top='+wint+',width='+width+',height='+height+',toolbar='+toolbar_str+',menubar='+menubar_str+',status='+statusbar_str+',scrollbars='+scrollbar_str+',resizable='+resizable_str);
}

function setWindowStatus(title) {
	self.status = title;
	return true;
};//end setWindowStatus

function showHideBlock(block) {
	obj = document.getElementById(block);
	obj.style.display = (obj.style.display == 'none') ? 'block' : 'none';
}