var LISTUtil = new Object();

LISTUtil.getSelectedIndexes = function (oListbox) {
    var arrIndexes = new Array;

    for (var i=0; i < oListbox.options.length; i++) {
        if (oListbox.options[i].selected) {
            arrIndexes.push(i);
        }
    }

    return arrIndexes;
};

LISTUtil.add = function (oListbox, sName, sValue) {
	var oListbox = $(oListbox);
    var oOption = document.createElement("option");
    DOMUtil.createText(oOption,sName);

    if (arguments.length == 3) {
        oOption.setAttribute("value", sValue);
    }

    oListbox.appendChild(oOption);
	return oOption;
}

LISTUtil.addGroup = function (oListbox, sLabel) {
	var oListbox = $(oListbox);
	var oOption = document.createElement("optgroup");
	oOption.setAttribute('label',sLabel);

	oListbox.appendChild(oOption);
	return oOption;
}

LISTUtil.removeOption = function (oListbox, sValue) {
	alert('removeOption is not available at this time');
/*
	alert('hit');
	alert(oListBox);
	var oListbox = $(oListbox);
	alert(sValue);
	for(var i = 0; i < oListbox.options.length; i++) {
		alert(oListbox.options[i].value);
		if(oListbox.options[i].value == sValue) {
			var iIndex = i;
		}
	}
    oListbox.remove(iIndex);
*/
};

/**
	oListbox	str | obj	targetted select object
	bZero		bool		whether to clear any "0" values (for default options typically)
*/
LISTUtil.clear = function (oListbox,bZero) {
	var oListbox = $(oListbox);
	if (oListbox.options.length == 0) {
		return false;
	}
	for (var i = oListbox.options.length-1; i >= 0; i--) {
		if (bZero && bZero == true) {
			oListbox.removeChild(oListbox.options[i]);
		} else if (oListbox.options[i].value > 0) {
			oListbox.removeChild(oListbox.options[i]);
		}
	}
};

LISTUtil.move = function (oListboxFrom, oListboxTo, iIndex) {
    var oOption = oListboxFrom.options[iIndex];

    if (oOption != null) {
        oListboxTo.appendChild(oOption);
		//oListboxTo.options[oListboxTo.options.length - 1].selected = false;
    }
};

LISTUtil.shiftUp = function (oListbox, iIndex) {
    if (iIndex > 0) {    
        var oOption = oListbox.options[iIndex];
        var oPrevOption = oListbox.options[iIndex-1];
        oListbox.insertBefore(oOption, oPrevOption);
    }    
};

LISTUtil.shiftDown = function (oListbox, iIndex) {
    if (iIndex < oListbox.options.length - 1) {
        var oOption = oListbox.options[iIndex];
        var oNextOption = oListbox.options[iIndex+1];
        oListbox.insertBefore(oNextOption, oOption);
    }
};

LISTUtil.setSelected = function (oListbox, sValue) {
	var oListbox = $(oListbox);
	for(var i = 0; i < oListbox.options.length; i++) {
		if(oListbox.options[i].value == sValue) {
			if (isIE) {
				oListbox.options[i].setAttribute('selected',true);
			} else {
				oListbox.options[i].selected = true;
			}
		}
	}
};