/*
 * FCKeditor - The text editor for internet
 * Copyright (C) 2003-2004 Frederico Caldeira Knabben
 * 
 * Licensed under the terms of the GNU Lesser General Public License:
 * http://www.opensource.org/licenses/lgpl-license.php
 * 
 * For further information visit:
 * http://www.fckeditor.net/
 * 
 * File Name: fck_dialog_common.js
 * Useful functions used by almost all dialog window pages.
 * 
 * Version:  2.0 RC3
 * Modified: 2005-02-09 13:52:45
 * 
 * File Authors:
 * Frederico Caldeira Knabben (fredck@fckeditor.net)
 */

// Gets a element by its Id. Used for shorter coding.
function GetE( elementId )
{
return document.getElementById( elementId )  ;
}

function ShowE( element, isVisible )
{
if ( typeof( element ) == 'string' )
element = GetE( element ) ;
element.style.display = isVisible ? '' : 'none' ;
}

function SetAttribute( element, attName, attValue )
{
if ( attValue == null || attValue.length == 0 )
element.removeAttribute( attName, 0 ) ;// 0 : Case Insensitive
else
element.setAttribute( attName, attValue, 0 ) ;// 0 : Case Insensitive
}

function GetAttribute( element, attName, valueIfNull )
{
var oAtt = element.attributes[attName] ;

if ( oAtt == null || !oAtt.specified )
return valueIfNull ? valueIfNull : '' ;

var oValue = element.getAttribute( attName, 2 ) ;

return ( oValue == null ? valueIfNull : oValue ) ;
}

// Functions used by text fiels to accept numbers only.
function IsDigit( e )
{
e = e || event ;
var iCode = ( e.keyCode || e.charCode ) ;

event.returnValue =
(
( iCode >= 48 && iCode <= 57 )// Numbers
|| (iCode >= 37 && iCode <= 40)// Arrows
|| iCode == 8// Backspace
|| iCode == 46// Delete
) ;

return event.returnValue ;
}

String.prototype.startsWith = function( value )
{
return ( this.substr( 0, value.length ) == value ) ;
}

String.prototype.remove = function( start, length )
{
var s = '' ;

if ( start > 0 )
s = this.substring( 0, start ) ;

if ( start + length < this.length )
s += this.substring( start + length , this.length ) ;

return s ;
}
