function truncate(number,accuracy) 
{
	try
	{
		number *= (1/accuracy) * 10;
		number = parseInt(number);
		
		var numLast = num.toString().charAt(num.toString().length-1);
		if (numlast >= 5) 
		{
			number++;
		}
		
		number /= 10;
		number *= accuracy;
		return number;
	}
	catch(e)
	{
		//alert(e.message)
	}
}

function copyResult(hiddenResultId)
{
	try
	{
		if(document.getElementById(hiddenResultId) != null && document.getElementById("size_metres") != null)
		{
			document.getElementById(hiddenResultId).value = document.getElementById("size_metres").value;
		}
	}
	catch(e)
	{
		//alert(e.message);
	}
}

function calculate(myform) 
{
	try
	{
		couch = parseFloat(myform.couch_volume.value) * parseFloat(myform.couch_number.value); 
		if (!(couch > 0)) couch = 0;
		myform.couch_result.value = couch;

		armchair = parseFloat(myform.armchair_volume.value) * parseFloat(myform.armchair_number.value); 
		if (!(armchair > 0)) armchair = 0;
		myform.armchair_result.value = armchair; 

		bed = parseFloat(myform.bed_volume.value) * parseFloat(myform.bed_number.value); 
		if (!(bed > 0)) bed = 0;
		myform.bed_result.value = bed; 

		dresser = parseFloat(myform.dresser_volume.value) * parseFloat(myform.dresser_number.value); 
		if (!(dresser > 0)) dresser = 0;
		myform.dresser_result.value = dresser; 

		endtable = parseFloat(myform.endtable_volume.value) * parseFloat(myform.endtable_number.value); 
		if (!(endtable > 0)) endtable = 0;
		myform.endtable_result.value = endtable;

		diningchair = parseFloat(myform.diningchair_volume.value) * parseFloat(myform.diningchair_number.value); 
		if (!(diningchair > 0)) diningchair = 0;
		myform.diningchair_result.value = diningchair;

		diningtable = parseFloat(myform.diningtable_volume.value) * parseFloat(myform.diningtable_number.value); 
		if (!(diningtable > 0)) diningtable = 0;
		myform.diningtable_result.value = diningtable; 

		lamp = parseFloat(myform.lamp_volume.value) * parseFloat(myform.lamp_number.value); 
		if (!(lamp > 0)) lamp = 0;
		myform.lamp_result.value = lamp; 

		tv = parseFloat(myform.tv_volume.value) * parseFloat(myform.tv_number.value); 
		if (!(tv > 0)) tv = 0;
		myform.tv_result.value = tv; 

		refrigerator = parseFloat(myform.refrigerator_volume.value) * parseFloat(myform.refrigerator_number.value); 
		if (!(refrigerator > 0)) refrigerator = 0;
		myform.refrigerator_result.value = refrigerator; 

		dryer = parseFloat(myform.dryer_volume.value) * parseFloat(myform.dryer_number.value); 
		if (!(dryer > 0)) dryer = 0;
		myform.dryer_result.value = dryer; 

		smallbox = parseFloat(myform.smallbox_volume.value) * parseFloat(myform.smallbox_number.value); 
		if (!(smallbox > 0)) smallbox = 0;
		myform.smallbox_result.value = smallbox; 

		medbox = parseFloat(myform.medbox_volume.value) * parseFloat(myform.medbox_number.value); 
		if (!(medbox > 0)) medbox = 0;
		myform.medbox_result.value = medbox; 

		largebox = parseFloat(myform.largebox_volume.value) * parseFloat(myform.largebox_number.value); 
		if (!(largebox > 0)) largebox = 0;
		myform.largebox_result.value = largebox; 

		dishbox = parseFloat(myform.dishbox_volume.value) * parseFloat(myform.dishbox_number.value); 
		if (!(dishbox > 0)) dishbox = 0;
		myform.dishbox_result.value = dishbox; 

		wardbox = parseFloat(myform.wardbox_volume.value) * parseFloat(myform.wardbox_number.value); 
		if (!(wardbox > 0)) wardbox = 0;
		myform.wardbox_result.value = wardbox; 

		myform.size_metres.value = couch + armchair + bed + dresser + endtable + diningchair + diningtable + lamp + tv + refrigerator + dryer + smallbox + medbox + largebox + dishbox + wardbox; 
	}
	catch(e)
	{
		//alert(e.message)
	}
}