var products=null;
function calculateSum()
{
	var tmpSum=0;
	$('#submitForm select').each(function(j){
		var i=parseInt(this.options[this.selectedIndex].value);
		if (i>-1)
			tmpSum+=products[j].prices[i].price;
	});
	$('#sum').html('Total sum: '+tmpSum+' USD');
}
function createOrderForm()
{
	$.getJSON('prices.json', function(data) {
		products=data.list;
	});
	calculateSum();
}