function _alert( _field, _str ) {
	_field.focus();
	alert( 'Please provide a' + _str + '.' );
	return false;
	}

function _confirm( _url ) {
	if ( confirm( 'Delete?' ) )
		window.location = _url;
	return false;
	}

function _getWindowHeight() {
	var _height = 0;
	if ( typeof( window.innerHeight ) == 'number' ) {
		_height = window.innerHeight;
		}
	return _height;
	}

function _init() {
	var _e, _elem, _i, _id, _minHeight;
	if ( document.getElementById ) {
		_elem = new Array();
		_id = new Array( 'left', 'center', 'right' );
		_minHeight = _getWindowHeight() - 70;
		for ( _i = 0; _i < _id.length; _i++ )
			if ( _e = document.getElementById( _id[ _i ] ) ) {
				_elem[ _elem.length ] = _e;
				_e.style.paddingBottom = '0px';
				if ( ( _e.offsetTop + _e.offsetHeight ) > _minHeight )
					_minHeight = _e.offsetTop + _e.offsetHeight;
				}
		for ( _i = 0; _i < _elem.length; _i++ ) {
			if ( ( _elem[ _i ].offsetTop + _elem[ _i ].offsetHeight ) < _minHeight ) {
				_elem[ _i ].style.paddingBottom = ( _minHeight - _elem[ _i ].offsetHeight - _elem[ _i ].offsetTop ) + 'px';
				}
			}
		}
	}