function emptyZero( element, act ){
	if( document.getElementById ){
		var e = document.getElementById( element );
		if( "on" == act ){
			if( 0 == e.value ){
				e.value = "";
			}
		}
		if( "off" == act ){
			if( "" == e.value ){
				e.value = 0;
			}
		}
	}
}

function FieldIncrease( field ){
	var quantity = parseInt( document.getElementById( 'quantity' + field ).value );
	quantity = quantity + 1;
	document.getElementById( 'quantity' + field ).value = quantity;
}

function FieldDecrease( field, min ){
	var quantity = parseInt( document.getElementById( 'quantity' + field ).value );
	quantity = quantity - 1;
	if( min <= quantity ){
		document.getElementById( 'quantity' + field ).value = quantity;
	}
}

function CartIncrease( field ){
	var quantity = parseInt( document.getElementById( 'quantity' + field ).value );
	quantity = quantity + 1;
	document.getElementById( 'quantity' + field ).value = quantity;
	var itempricevalue = parseFloat( document.getElementById( 'itempricevalue' + field ).value );
	itempricevalue = (itempricevalue * quantity).toFixed(2);
	document.getElementById( 'itemprice' + field ).innerHTML = itempricevalue;
}

function CartDecrease( field, min ){
	var quantity = parseInt( document.getElementById( 'quantity' + field ).value );
	quantity = quantity - 1;
	if( min <= quantity ){
		document.getElementById( 'quantity' + field ).value = quantity;
		var itempricevalue = parseFloat( document.getElementById( 'itempricevalue' + field ).value );
		itempricevalue = (itempricevalue * quantity).toFixed(2);
		document.getElementById( 'itemprice' + field ).innerHTML = itempricevalue;
	}
}

function CartRecalculate(){
	var orderprice = 0;
	var orderquantity = 0;
	for( i = 0; i < document.forms['fEshopCart'].elements.length; i++ ){
		var item = document.forms['fEshopCart'].elements[i];
		if( item.name == 'item[]' ){
			itempricevalue = parseFloat( document.getElementById( 'itempricevalue' + item.value ).value );
			itempricevalue = itempricevalue * document.getElementById( 'quantity' + item.value ).value;
			orderprice = orderprice + itempricevalue;
			orderquantity = orderquantity + parseInt( document.getElementById( 'quantity' + item.value ).value );
		}
	}
	orderprice = orderprice.toFixed(2);
	document.getElementById( 'orderprice' ).innerHTML = orderprice;
	document.getElementById( 'orderquantity' ).innerHTML = orderquantity;

}