var DEFINE_VAT;

function determine_vat_rate(){
	var d = new Date();
	var rate = 17.5;
	if(d.valueOf()/1000 > 1228089600){ // 1st Dec 2008 rate cut to 15%
		rate = 15;
	}
	if(d.valueOf()/1000 > 1262304000){ // 1st Jan 2010 rate to go back up to 17.5 - or more
		rate = 17.5;
	}
	DEFINE_VAT = rate;
}

determine_vat_rate();