function hasOptions(obj) {
	if (obj!=null && obj.options!=null) { return true; }
	return false;
}

function moveSelectedOptions(from,to) {
	// Move them over
	if (!hasOptions(from)) { return; }
	for (var i=from.options.length - 1; i >= 0; i--) {
		if (from.options[i].selected) {
			var NewOption   = document.createElement("OPTION");
			NewOption.text  = from.options[i].text;
			NewOption.value = from.options[i].value;
			
			to.options[to.options.length] = NewOption;
			
			from.options[i] = null;
		}
	}
	
	from.selectedIndex = -1;
	to.selectedIndex = -1;
}

function removeSelectedOptions(from) {
	for (var i=(from.options.length-1); i>=0; i--) {
		var o = from.options[i];
		if (o.selected) {
			from.options[i] = null;
		}
	}
	
	from.selectedIndex = -1;
}

function removeAllOptions(from) {
	for (var i=(from.options.length-1); i>=0; i--) {
		from.options[i] = null;
	}
	
	from.selectedIndex = -1;
}

function sortSelect(obj) {
	var o = new Array();
	if (!hasOptions(obj)) { return; }
	for (var i=0; i<obj.options.length; i++) {
		o[o.length] = new Option( obj.options[i].text, obj.options[i].value, obj.options[i].defaultSelected, obj.options[i].selected) ;
	}

	if (o.length==0) { return; }
	o = o.sort( 
		function(a,b) { 
			if ((a.text+"") < (b.text+"")) { return -1; }
			if ((a.text+"") > (b.text+"")) { return 1; }
			return 0;
		} 
	);

	for (var i=0; i<o.length; i++) {
		obj.options[i] = new Option(o[i].text, o[i].value, o[i].defaultSelected, o[i].selected);
	}
}

function moveAllOptions(from,to) {
	selectAllOptions(from);
	if (arguments.length==2) {
		moveSelectedOptions(from,to);
	}
	else if (arguments.length==3) {
		moveSelectedOptions(from,to,arguments[2]);
	}
	else if (arguments.length==4) {
		moveSelectedOptions(from,to,arguments[2],arguments[3]);
	}
}

function selectAllOptions(obj) {
	if (!hasOptions(obj)) { return; }
	for (var i=0; i<obj.options.length; i++) {
		obj.options[i].selected = true;
	}
}

function moveOptionUp(obj) {
	if (!hasOptions(obj)) { return; }
	for (i=0; i<obj.options.length; i++) {
		if (obj.options[i].selected) {
			if (i != 0 && !obj.options[i-1].selected) {
				swapOptions(obj,i,i-1);
				obj.options[i-1].selected = true;
			}
		}
	}
}

function moveOptionDown(obj) {
	if (!hasOptions(obj)) { return; }
	for (i=obj.options.length-1; i>=0; i--) {
		if (obj.options[i].selected) {
			if (i != (obj.options.length-1) && ! obj.options[i+1].selected) {
				swapOptions(obj,i,i+1);
				obj.options[i+1].selected = true;
			}
		}
	}
}

function swapOptions(obj,i,j) {
	var o = obj.options;
	var i_selected = o[i].selected;
	var j_selected = o[j].selected;
	var temp = new Option(o[i].text, o[i].value, o[i].defaultSelected, o[i].selected);
	var temp2= new Option(o[j].text, o[j].value, o[j].defaultSelected, o[j].selected);
	o[i] = temp2;
	o[j] = temp;
	o[i].selected = j_selected;
	o[j].selected = i_selected;
}