Datepicker: Determine weekend days based on locale

Current implementation of datepicker enforces Saturday and Sunday as weekend days, without any thought about countries where this is not the case. See here:

http://en.wikipedia.org/wiki/Workweek_and_weekend

A configuration option to be able to set weekend days is sorely lacking at the moment, and can be achieved with a simple patch like this:

@@ -4352,12 +4352,13 @@
 		dayNames: ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"], // For formatting
 		dayNamesShort: ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"], // For formatting
 		dayNamesMin: ["Su","Mo","Tu","We","Th","Fr","Sa"], // Column headings for days starting at Sunday
 		weekHeader: "Wk", // Column header for week of the year
 		dateFormat: "mm/dd/yy", // See format options on parseDate
 		firstDay: 0, // The first day of the week, Sun = 0, Mon = 1, ...
+		weekendDays: [0, 6], //List of days considered as weekend, Sun = 0, Mon = 1, ...
 		isRTL: false, // True if right-to-left language, false if left-to-right
 		showMonthAfterYear: false, // True if the year select precedes month, false for month then year
 		yearSuffix: "" // Additional text to append to the year in the month headers
 	};
 	this._defaults = { // Global defaults for all the date picker instances
 		showOn: "focus", // "focus" for popup on focus,
@@ -5880,13 +5881,13 @@
 		});
 	},
 
 	/* Generate the HTML for the current state of the date picker. */
 	_generateHTML: function(inst) {
 		var maxDraw, prevText, prev, nextText, next, currentText, gotoDate,
-			controls, buttonPanel, firstDay, showWeek, dayNames, dayNamesMin,
+			controls, buttonPanel, firstDay, weekendDays, showWeek, dayNames, dayNamesMin,
 			monthNames, monthNamesShort, beforeShowDay, showOtherMonths,
 			selectOtherMonths, defaultDate, html, dow, row, group, col, selectedDate,
 			cornerClass, calender, thead, day, daysInMonth, leadDays, curRows, numRows,
 			printDate, dRow, tbody, daySettings, otherMonth, unselectable,
 			tempDate = new Date(),
 			today = this._daylightSavingAdjust(
@@ -5957,12 +5958,13 @@
 			(this._isInRange(inst, gotoDate) ? "<button type='button' class='ui-datepicker-current ui-state-default ui-priority-secondary ui-corner-all' data-handler='today' data-event='click'" +
 			">" + currentText + "</button>" : "") + (isRTL ? "" : controls) + "</div>" : "";
 
 		firstDay = parseInt(this._get(inst, "firstDay"),10);
 		firstDay = (isNaN(firstDay) ? 0 : firstDay);
 
+		weekendDays = this._get(inst, "weekendDays");
 		showWeek = this._get(inst, "showWeek");
 		dayNames = this._get(inst, "dayNames");
 		dayNamesMin = this._get(inst, "dayNamesMin");
 		monthNames = this._get(inst, "monthNames");
 		monthNamesShort = this._get(inst, "monthNamesShort");
 		beforeShowDay = this._get(inst, "beforeShowDay");
@@ -5998,13 +6000,13 @@
 					row > 0 || col > 0, monthNames, monthNamesShort) + // draw month headers
 					"</div><table class='ui-datepicker-calendar'><thead>" +
 					"<tr>";
 				thead = (showWeek ? "<th class='ui-datepicker-week-col'>" + this._get(inst, "weekHeader") + "</th>" : "");
 				for (dow = 0; dow < 7; dow++) { // days of the week
 					day = (dow + firstDay) % 7;
-					thead += "<th" + ((dow + firstDay + 6) % 7 >= 5 ? " class='ui-datepicker-week-end'" : "") + ">" +
+					thead += "<th" + (weekendDays.indexOf(day)!=-1 ? " class='ui-datepicker-week-end'" : "") + ">" +
 						"<span title='" + dayNames[day] + "'>" + dayNamesMin[day] + "</span></th>";
 				}
 				calender += thead + "</tr></thead><tbody>";
 				daysInMonth = this._getDaysInMonth(drawYear, drawMonth);
 				if (drawYear === inst.selectedYear && drawMonth === inst.selectedMonth) {
 					inst.selectedDay = Math.min(inst.selectedDay, daysInMonth);
@@ -6022,13 +6024,13 @@
 						daySettings = (beforeShowDay ?
 							beforeShowDay.apply((inst.input ? inst.input[0] : null), [printDate]) : [true, ""]);
 						otherMonth = (printDate.getMonth() !== drawMonth);
 						unselectable = (otherMonth && !selectOtherMonths) || !daySettings[0] ||
 							(minDate && printDate < minDate) || (maxDate && printDate > maxDate);
 						tbody += "<td class='" +
-							((dow + firstDay + 6) % 7 >= 5 ? " ui-datepicker-week-end" : "") + // highlight weekends
+							(weekendDays.indexOf((dow + firstDay) % 7)!=-1 ? " ui-datepicker-week-end" : "") + // highlight weekends
 							(otherMonth ? " ui-datepicker-other-month" : "") + // highlight days from other months
 							((printDate.getTime() === selectedDate.getTime() && drawMonth === inst.selectedMonth && inst._keyEvent) || // user pressed key
 							(defaultDate.getTime() === printDate.getTime() && defaultDate.getTime() === selectedDate.getTime()) ?
 							// or defaultDate is current printedDate and defaultDate is selectedDate
 							" " + this._dayOverClass : "") + // highlight selected day
 							(unselectable ? " " + this._unselectableClass + " ui-state-disabled": "") +  // highlight unselectable days