function getCookieVal(offset) {
	var endstr = document.cookie.indexOf(";", offset);
	if (endstr == -1)
		endstr = document.cookie.length;
	return unescape(document.cookie.substring(offset, endstr));
}

function FixCookieDate(date) {
	var base = new Date(0);
	var skew = base.getTime(); // dawn of (Unix) time - should be 0
	if (skew > 0) // Except on the Mac - ahead of its time
		date.setTime(date.getTime() - skew);
}

function GetCookie(name) {
	var arg = name + "=";
	var alen = arg.length;
	var clen = document.cookie.length;
	var i = 0;
	while (i < clen) {
		var j = i + alen;
		if (document.cookie.substring(i, j) == arg)
			return getCookieVal(j);
		i = document.cookie.indexOf(" ", i) + 1;
		if (i == 0)
			break;
	}
	return null;
}

function SetCookie(name, value, expires, path, domain, secure) {
	document.cookie = name + "=" + escape(value)
			+ ((expires) ? "; expires=" + expires.toGMTString() : "")
			+ ((path) ? "; path=" + path : "")
			+ ((domain) ? "; domain=" + domain : "")
			+ ((secure) ? "; secure" : "");
}

function DeleteCookie(name, path, domain) {
	if (GetCookie(name)) {
		document.cookie = name + "=" + ((path) ? "; path=" + path : "")
				+ ((domain) ? "; domain=" + domain : "")
				+ "; expires=Thu, 01-Jan-70 00:00:01 GMT";
	}
}

function linksExternal() {
	if (document.getElementsByTagName) {
		var anchors = document.getElementsByTagName("a");
		for ( var i = 0; i < anchors.length; i++) {
			var anchor = anchors[i];
			if (anchor.getAttribute("rel") == "external") {
				anchor.target = "_blank";
			}
		}
	}
}

function checkHeight() {
	var obj = document.getElementById('center');
	if (obj.offsetHeight < 700) {
		obj.style.height = '700px';
	}
}

function stat() {
	var res;
	win = window.screen;
	if (window.screen)
		res = win.width + 'x' + win.height;
	var czas = new Date();
	czas.setTime(czas.getTime() + (365 * 24 * 60 * 60 * 1000));
	SetCookie("stat", res, czas, '/');
}

function slide(field) {
	if (document.getElementById(field).style.display == 'none')
		new Effect.BlindDown(field, {
			duration :0.6
		});
	else
		new Effect.BlindUp(field, {
			duration :0.6
		});
}

function contact_slide(field) {
	if (document.getElementById(field).style.display != 'none') {
		new Effect.BlindUp(field, {
			duration :0.6
		});
	}	
}