How to disable (or enable - reverse true/false in nonPartyDays function ) days of the week in jQuery UI Datepicker based on which days are checked off.

daysoftheweek.html

<table id="daysoftheweek">
	<tr>
		<th>Sun</th>
		<th>Mon</th>
		<th>Tue</th>
		<th>Wed</th>
		<th>Thu</th>
		<th>Fri</th>
		<th>Sat</th>    
	</tr>
	<tr>
		<td><input type="checkbox" value="0" class="availableDays" /></td>
		<td><input type="checkbox" value="1" class="availableDays" /></td>
		<td><input type="checkbox" value="2" class="availableDays" /></td>
		<td><input type="checkbox" value="3" class="availableDays" /></td>
		<td><input type="checkbox" value="4" class="availableDays" /></td>
		<td><input type="checkbox" value="5" class="availableDays" /></td>
		<td><input type="checkbox" value="6" class="availableDays" /></td>
	</tr>
</table> 

<input type="text" name="eventDay" id="eventDay" />

daysoftheweek.js

var needToSeeDaysOfWeek = new Array();
$(function() {
		$("#eventDay").datepicker({
				showOn: "button",
				buttonImage: "https://cdn1.iconfinder.com/data/icons/icojoy/noshadow/standart/png/24x24/001_44.png",
				buttonImageOnly: false,
				dateFormat: 'mm/dd/yy',
				minDate: 0,
				beforeShowDay: nonPartyDays
		});
		$("#daysoftheweek input:checkbox").change(function(){
				var v=$(this).attr("value")*1;
				var f=$.inArray(v,needToSeeDaysOfWeek);
				if($(this).is(":checked")){
						if(f<0){
								needToSeeDaysOfWeek.push(v);
						}
				}else{
						if(f>=0){
								needToSeeDaysOfWeek.splice(f,1);
						}               
				}
		});
});

function nonPartyDays(date){
		var day = date.getDay();
		for(var i=0;i<needToSeeDaysOfWeek.length;i++){
			 if(day==needToSeeDaysOfWeek[i]){
					 return [false];
			 }
		}   
		return [true];
}