/**
 * Read the JavaScript cookies tutorial at:
 *   http://www.netspade.com/articles/javascript/cookies.xml
 */

/**
 * Sets a Cookie with the given name and value.
 *
 * name       Name of the cookie
 * value      Value of the cookie
 * [expires]  Expiration date of the cookie (default: end of current session)
 * [path]     Path where the cookie is valid (default: path of calling document)
 * [domain]   Domain where the cookie is valid
 *              (default: domain of calling document)
 * [secure]   Boolean value indicating if the cookie transmission requires a
 *              secure transmission
 */
function setCookie(name, value, days, path, domain, secure)
{
        var expdate = new Date(); 
        if (!days) days = 1;
        expdate.setTime(expdate.getTime() + days*24*60*60*1000);

        document.cookie= name + "=" + escape(value) +
        "; expires=" + expdate.toGMTString() + 
        ((path) ? "; path=" + path : "") +
        ((domain) ? "; domain=" + domain : "") +
        ((secure) ? "; secure" : "");

}

/**
 * Gets the value of the specified cookie.
 *
 * name  Name of the desired cookie.
 *
 * Returns a string containing value of specified cookie,
 *   or null if cookie does not exist.
 */
function getCookie(name)
{
    var dc = document.cookie;
    var prefix = name + "=";
    var begin = dc.indexOf("; " + prefix);
    if (begin == -1)
    {
        begin = dc.indexOf(prefix);
        if (begin != 0) return null;
    }
    else
    {
        begin += 2;
    }
    var end = document.cookie.indexOf(";", begin);
    if (end == -1)
    {
        end = dc.length;
    }
    return unescape(dc.substring(begin + prefix.length, end));
}

/**
 * Deletes the specified cookie.
 *
 * name      name of the cookie
 * [path]    path of the cookie (must be same as path used to create cookie)
 * [domain]  domain of the cookie (must be same as domain used to create cookie)
 */
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";
    }
}

// Global variables.
domain		= '';
path		= '/';
secure		= 0;

// Function to save a field.
function save_field(obj) {
	var cookie_value = '';
	var objType = new String(obj.type);
	switch(objType.toLowerCase()) {
		case "checkbox" :
			if (obj.checked) cookie_value = obj.name + '=[1]'
			else cookie_value = obj.name + '=[0]'
			break;
		case "undefined" :
			// a.k.a. radio field.
			for (var i = 0; i < obj.length; i++) {
				if (obj[i].checked) cookie_value = obj[i].name + '=[' + i + ']'
			}
			break;
		case "select-one" :
			cookie_value = obj.name + '=[' + obj.selectedIndex + ']';
			break;
		case "select-multiple" :
			cookie_value = obj.name + '=[';
			for (var i = 0; i < obj.options.length; i++) {
				if (obj.options[i].selected) cookie_value += '+' + i
			}
			cookie_value += ']';
			break;
		default :
			// We assume all other fields will have
			// a valid obj.name and obj.value
			cookie_value = obj.name + '=[' + obj.value + ']';
	}
	if (cookie_value) {
		var expires = new Date();
		expires.setYear(expires.getYear() + 1);
		document.cookie = cookie_value +
		((domain.length > 0) ? ';domain=' + domain : '') +
		((path) ? ';path=' + path : '') +
		((secure) ? ';secure' : '') +
		';expires=' + expires.toGMTString();
	}
	return 1;
}

// Function to retrieve a field.
function retrieve_field(obj) {
	var cookie = '', real_value = '';
	cookie = document.cookie;
	var objType = new String(obj.type);
	if (obj.name)
		var objName = new String(obj.name);
	else
		var objName = new String(obj[0].name);
	var offset_start = cookie.indexOf(objName + '=[');
	if (offset_start == -1) return 1;
	var offset_start_length = objName.length + 2;
	offset_start = offset_start + offset_start_length;
	var offset_end = cookie.indexOf(']', offset_start);
	real_value = cookie.substring(offset_start, offset_end);
	switch(objType.toLowerCase()) {
		case "checkbox" :
			if (real_value == '1') obj.checked = 1
			else obj.checked = 0
			break;
		case "undefined" :
			obj[real_value].checked = 1;
			break;
		case "select-one" :
			obj.selectedIndex = real_value;
			break;
		case "select-multiple" :
			for (var i = 0; i < obj.options.length; i++) {
				if ((real_value.indexOf('+' + i)) > -1)
					obj.options[i].selected = 1;
				else
					obj.options[i].selected = 0;
			}
			break;
		default :
			obj.value = real_value;
			break;
	}
	return 1;
}
// End JavaScript -->


function hideLayer(whichLayer) {

if (document.getElementById) {

document.getElementById(whichLayer).style.visibility = "hidden";
}
else if (document.all) {

document.all[whichlayer].style.visibility = "hidden";
}
else if (document.layers) {

document.layers[whichLayer].visibility = "hidden";
}

}

function showLayer(whichLayer) {

if (document.getElementById) {

document.getElementById(whichLayer).style.visibility = "visible";
}
else if (document.all) {

document.all[whichlayer].style.visibility = "visible";
}
else if (document.layers) {

document.layers[whichLayer].visibility = "visible";
}

}

function handleClick(whichClick,dv) {

if (whichClick == "hide it") {

hideLayer(dv);

}
else if (whichClick == "show it") {

showLayer(dv);
}

}