/* Returned option id */
function ById(div_id)
{
	return document.getElementById(div_id);
}

/* Secure mail before spam */
function SecureMail(name, domain)
{
	document.write('<a href="mailto:'+name+'@'+domain+'">'+name+'@'+domain+'</a>');
}

/* Secure mail author before spam */
function SecureMailAuthor(name, domain, fullname)
{
	document.write('<a href="mailto:'+name+'@'+domain+'">'+fullname+'</a>');
}

/* View layer */
function ShowLayer(element_id)
{
	if (ById(element_id).style.display == 'block') {
		ById(element_id).style.display = 'none';
	} else if (ById(element_id).style.display = 'none') {
		ById(element_id).style.display = 'block';
	}
}

/* Show photo */
function ShowPhoto(url, width, height) 
{
	window.open('/_userFile/' + url, 'Powiększenie', 'width='+width+', height='+height+', scrollbars=yes, resizable=no, menubar=no');
}

/* Clear form field */
function ClearField(field)
{
	if (field.defaultValue == field.value) {
		field.value = '';
	}
}

/* Remove layer */
function Close(div_id)
{
    var element = document.getElementById(div_id);
    element.parentNode.removeChild(element);
}