gistfile1.js

function getMonday() {
	var date = new Date();

	// Set date to Monday just gone
	var day = date.getDay()
	date.setDate(date.getDate() - (day == 0 ? -6:1));

	// Zero time
	date.setHours(0);
	date.setMinutes(0);
	date.setSeconds(0);
	date.setMilliseconds(0);

	return date.toISOString();
}

new TimeBasedCountingWidget({
	targetClassName: 'money-since-start',
	startDate: getMonday(),
	countMultiplier: 57,
	counttype:'money',
	prefix: '<span class="sign">&pound;</span>'
});