// Show something
function show(name)
{
	var show_div = document.getElementById(name);
	show_div.style.display = '';
}

// Hide something
function hide(name)
{
	var hide_div = document.getElementById(name);
	hide_div.style.display = 'none';
}

// Clear a field
function clear_field(field_id, default_contents)
{
	var current_contents = document.getElementById(field_id).value;
	
	if(current_contents == default_contents)
	{
		document.getElementById(field_id).value = "";
	}
}

// Fill a field
function fill_field(field_id, fill_contents)
{
	var current_content = document.getElementById(field_id).value;
	
	if(current_content == '')
	{
		document.getElementById(field_id).value = fill_contents;
	}
}

// Text Size Switcher
function setActiveStyleSheet(title) {
	var i, a, main;
	for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
		if(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").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").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;
}

window.onload = function(e) {
	var cookie = readCookie("style");
	var title = cookie ? cookie : getPreferredStyleSheet();
	setActiveStyleSheet(title);
	if(cookie == 'large')
	{
		hide('increase');
		show('decrease');
	}
}

window.onunload = function(e) {
	var title = getActiveStyleSheet();
	createCookie("style", title, 365);
}

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);

// Share hide function
function share_link_toggle(div_id)
{
	var share_status = document.getElementById(div_id).style.display;
	
	if (share_status == 'none')
	{
		document.getElementById(div_id).style.display = '';
	}
	else
	{
		document.getElementById(div_id).style.display = 'none';
	}
	
	return false;
}

// Share tab function
function tab_show_hide(show, hide, show_tab, hide_tab)
{
	document.getElementById(hide).style.display = 'none';
	document.getElementById(show).style.display = '';
	
	document.getElementById(show_tab).className = 'selected';
	document.getElementById(hide_tab).className = '';
	
	return false;
}