/**
 * Add, remove and test (for) classnames from (HTML) DOM-objects Objects known by there identifier.
 * The functions test if is o an object. If not, try get the element by id.
 * @author: Jörg Reinholz, fastix WebDesign & Consult, Kassel - http://www.fastix.org/
 * @version: 1.0.2
 * code.fastix.org ist NOT a cdn and verry slow! Download this and use your OWN server to deliver this!
**/


function addClassName( o, cName ) {
	o = getOrCheckObjekt( o );
	if ( o && ( ! hasClassName( o, cName ) ) ) {
		if ( o.className ) {
			var s = o.className + ' ' +  cName;
			o.className = s.replace( /^ +/ ).replace( / +$/ );
		} else {
			o.className = cName;
		}
		return true;
	}
	return false;
}

function removeClassName( o, cName ) {
    o = getOrCheckObjekt( o );
    if ( o ) {
        if( cName == o.className ) {
            o.className = '';
            return true;
        } else {
            var c = o.className;
            var a = c.split( / +/ );
            var aNew = new Array();
            var m = 0;
            for ( var i = 0; i < a.length; i++ ) {
                if ( cName != a[i] ) {
                    aNew[++m] = a[i];
                }
            }
            o.className = aNew.join(' ');
            return true
        }
    }
    return false;
}

function hasClassName( o, cName ) {
    o = getOrCheckObjekt( o );
    if ( o ) {
        var c = o.className;
        var a = c.split( / +/ );
        for ( var i = 0; i < a.length; i++ ) {
            if ( cName == a[i] ) {
                return true;
            }
        }
    }
    return false;
}

function getOrCheckObjekt( o ) {
    if ( ! 'object' == typeof( o ) ) {
        o = document.getElementById( o );
    }

    if ( 'object' == typeof( o ) ) {
        return o;
    }
    console.log( 'kein Objekt übergeben, "' + o + '" ist unbekannt"' );
    return false;
}