function count(){
	var pc = 220;
	var mac = 180;
	var tft_small = 60;
	var tft_med = 90;
	var tft_large = 120;
	
	var aircon = 700;
	var aircon_surge = 1600;
	var mobilecharger = 8;
	var laptopcharger = 85;
	var fridge = 30;
	var fridge_surge = 125;
	var drinksmachine = 5;
	var drinksmachine_surge = 1200;
	
	var surgetotal = 0;
	var total_sundries = 0;
	var power_total = 0;
	
	 if (document.calc.platform.value == 'pc'){
		var total_systems = pc * document.calc.numbersystems.value;
	} else if (document.calc.platform.value == 'mac'){
		var total_systems = mac * document.calc.numbersystems.value;
	}
	
	 if (document.calc.display.value == '19'){
		var total_displays = tft_small * document.calc.numberdisplays.value;
	} else if (document.calc.display.value == '24'){
		var total_displays = tft_med * document.calc.numberdisplays.value;
	} else if (document.calc.display.value == '30'){
		var total_displays = tft_large * document.calc.numberdisplays.value;
	}
	
	if (document.calc.aircon.checked){
		var total_sundries = total_sundries + aircon;
		if (surgetotal < aircon_surge){
			var surgetotal = aircon_surge;
		}
	}
	if (document.calc.mobilecharger.checked){
		var total_sundries = total_sundries + mobilecharger;
	}
	if (document.calc.laptopcharger.checked){
		var total_sundries = total_sundries + laptopcharger;
	}
	if (document.calc.fridge.checked){
		var total_sundries = total_sundries + fridge;
		if (surgetotal < fridge_surge){
			var surgetotal = fridge_surge;
		}
	}
	if (document.calc.drinksmachine.checked){
		var total_sundries = total_sundries + drinksmachine;
		if (surgetotal < drinksmachine_surge){
			var surgetotal = drinksmachine_surge;
		}
	}
	
	var powertotal = total_systems + total_displays + total_sundries;
	var required = surgetotal * 0.6;
	var required = required + powertotal;
	
	if (required < surgetotal){
		var required = surgetotal + ((surgetotal/100)*15);
	}
	
	document.getElementById('power').innerHTML = powertotal;
	document.getElementById('power_surge').innerHTML = surgetotal;
	document.getElementById('power_total').innerHTML = required;
}