JAVASCRIPT : DATAPICKER de jquery , mettre les week-end en rouge

ajouter dans le css:

.ui-datepicker td.red a{
color:#f00 !important;
}

exemple de datapicker

var from = $("#dateStart")
.datepicker({
defaultDate: "+1w",
firstDay: 1,
changeMonth: true,
numberOfMonths: 3,
dateFormat: dateFormat
})
.on("change", function () {
to.datepicker("option", "minDate", getDate(this));
onDateStartSet();
}),
to = $("#dateEnd").datepicker({
defaultDate: "+1w",
changeMonth: true,
numberOfMonths: 3,
dateFormat: dateFormat
})
.on("change", function () {
from.datepicker("option", "maxDate", getDate(this));
onDateEndSet();
});