function ndeSetTextSize(chgsize,rs) {
	var startSize;
	var newSize;

	if (!document.getElementsByTagName) {
		return;
	}

	startSize = parseInt(ndeGetDocTextSize());

	if (!startSize) {
		startSize = 10;
	}

	switch (chgsize) {
		case 'incr':
		newSize = startSize + 1;
		break;

		case 'decr':
		newSize = startSize - 1;
		break;

		case 'reset':
		if (rs) {
			newSize = rs;
		} else {
			newSize = 10;
		}
		break;

		default:
		newSize = parseInt(ndeReadCookie("nde-textsize", true));
		if (!newSize) {
			newSize = startSize;
		}
		break;
	}

	if (newSize < .50) {
		newSize = .50;
	}

	newSize += 'px';

	document.getElementsByTagName('html')[0].style.fontSize = newSize;
	document.getElementsByTagName('body')[0].style.fontSize = newSize;

	ndeCreateCookie("nde-textsize", newSize, 365, true);
}

function ndeGetDocTextSize() {
	if (!document.getElementsByTagName) {
		return 0;
	}

	var size = 0;
	var body = document.getElementsByTagName('body')[0];

	if (body.style && body.style.fontSize) {
		size = body.style.fontSize;
	} else if (typeof(getComputedStyle) != 'undefined') {
		size = getComputedStyle(body,'').getPropertyValue('font-size');
	} else if (body.currentStyle) {
		size = body.currentStyle.fontSize;
	}
	return size;
}

function ndeSetStyleSheet(newtitle) {
  // this function exists solely to 
  // distinguish when the user chooses a new
  // theme. IE does not properly reflow the page
  // when a new theme is chosen and we must force
  // a reload when IE users choose a new theme.

	ndeSetStyleSheetInternal(newtitle);
	if (
		navigator.userAgent.indexOf('MSIE') != -1 && 
		!window.opera && 
		navigator.product != 'Gecko'
		) {
		history.go(0);
	}
}

function ndeSetStyleSheetInternal(newtitle) {
	if (!document.getElementsByTagName) {
		return;
	}

	var i;
	var savedtitle = '';
	var links = document.getElementsByTagName("link");

	if (!newtitle) {
		newtitle = savedtitle = ndeReadCookie("nde-style", false);
	}

	if (!newtitle) {
		newtitle = ndeGetPreferredStyleSheet();
	}

	var activesheet = null;
	for (i = 0; i < links.length; i++) {
		var a = links[i];
		var rel = a.getAttribute('rel');
		var title = a.getAttribute('title');

		if (rel.indexOf("style") != -1 && title) {
			a.disabled = true;
			if (title == newtitle) {
				activesheet = a;
			}
		}
	}

	if (activesheet) {
		activesheet.disabled = false;
	}

	if (newtitle != savedtitle) {
	ndeCreateCookie("nde-style", newtitle, 365, false);
	}
}

function ndeGetActiveStyleSheet() {
	if (!document.getElementsByTagName) {
		return null;
	}

	var i;
	var links = document.getElementsByTagName("link");

	for(i = 0; i < links.length; i++) {
		var a = links[i];
		var rel = a.getAttribute('rel');
		var title = a.getAttribute('title');

		if (rel.indexOf("style") != -1 && title && !a.disabled) {
			return title;
		}
	}
	return null;
}

function ndeGetPreferredStyleSheet() {
	if (!document.getElementsByTagName) {
		return null;
	}

	var i, a;
	var links = document.getElementsByTagName("link");

	for (i = 0; i <  links.length; i++) {
		a = links[i];
		var rel = a.getAttribute('rel');
		var title = a.getAttribute('title');

		if (rel.indexOf("style") != -1 && rel.indexOf("alt") == -1 && title) {
			return title;
		}
	}
	return null;
}

function ndeCreateCookie(name,value,days,useLang) {
	var langString = useLang ? ndeGetLang() : "";
	var cookie = name + langString + "=" + value + ";";

	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		cookie += " expires=" + date.toGMTString() + ";";
	}

	cookie += " path=/";
	document.cookie = cookie;
}

function ndeReadCookie(name, useLang) {
	var langString = useLang ? ndeGetLang() : "";
	var nameEQ = name + langString + "=";
	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 ndeSetTheme() {
	checkForUpgrade();
	ndeSetStyleSheetInternal();
	ndeSetTextSize();
	return true;
}

function ndeGetLang() {
	var langString = "";

	if (document.documentElement){
		langString = document.documentElement.lang;
		if (langString != ""){
			langString = "-" + langString;
		}
	}  
	return langString;
}

function checkForUpgrade() {
	var rvValue = -1;
	var isSafari = false;

	if (navigator.product == 'Gecko') {
		rvValue = 0;
		var ua      = navigator.userAgent.toLowerCase();
		var rvStart = ua.indexOf('rv:');
		var rvEnd   = ua.indexOf(')', rvStart);
		var rv      = ua.substring(rvStart+3, rvEnd);
		var rvParts = rv.split('.');
		var exp     = 1;

		for (var i = 0; i < rvParts.length; i++) {
			var val = parseInt(rvParts[i]);
			rvValue += val / exp;
			exp *= 100;
		}
	}

	if (navigator.userAgent.indexOf('Safari') != -1) {
		isSafari = true;
	}

	if (!document.getElementById || ( rvValue >= 0 && rvValue < 1.0) || isSafari) {
		var updateMessageShown = ndeReadCookie('upgrade');
		if (!updateMessageShown) {
			ndeCreateCookie('upgrade','1', 90);
			// check if cookie written. If not, don't redirect
			if (ndeReadCookie('upgrade')) {
				document.location = 'http://devedge.netscape.com/upgrade.html';
			}
		}
	}
}