//Preload these two images
/* plusImage = new Image();
plusImage.src= "/exp_plus.gif";

minusImage = new Image();
minusImage.src= "/exp_minus.gif";
*/

function ConfirmBox(message) {
	var flag=confirm(message);
	return flag;
}

function InsertLink(txtarea) {
	var selLength = txtarea.textLength;
	var selStart = txtarea.selectionStart;
	var selEnd = txtarea.selectionEnd;
	if (selStart == selEnd) {
		alert('No text selected.');
		return txtarea.value;
	}

	var url = prompt("Enter the URL to link:", "http://");
	if (url == null) {
		return txtarea.value;
	}
	var result = txtarea.value.substring(0, selStart);
	result = result + "<A HREF=\"" + url + "\">" + txtarea.value.substring(selStart, selEnd) + "</A>";
	result = result + txtarea.value.substring(selEnd, selLength);
	return result;
}

	
	
function HideElt(id, lin) {
	var iframe;
	var img;
	var expiry;
		
	elt = parent.document.getElementById(id);
	img = parent.document.getElementById(lin);
	expiry = new Date();
	expiry.setFullYear("2020");

	if (elt) {
		if (elt.style.display == '') {
			elt.style.display = 'none';
			img.src = 'exp_plus.gif';
			//img = plusImage;
			img.disabled = false;
			setCookie(id, 'false', expiry);
		}
		else {
			elt.style.display = '';
			img.src = 'exp_minus.gif';
			//img = minusImage;
			img.disabled = false;
			setCookie(id, 'true', expiry);
		}
	}
	return true;
}




/**
 * 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, expires, path, domain, secure)
{
    document.cookie= name + "=" + escape(value) +
        ((expires) ? "; expires=" + expires.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";
    }
}