function $(element)
{
	return document.getElementById(element);
}
function js_money()
{
	
	var shop_price = 1380;  //商品单价
	
	var obj = document.myform;
	
	var buy_num = $('chanpintaishu').value;
	
	/*---------------购买数量控制---------------------------*/
	
	if (buy_num == '' || isNaN(buy_num))
	{
		
		//$('chanpintaishu').value = 1;
		
		buy_num = 1;
	}
	else
	{
		if(buy_num < 1 )
		{
			
			//$('chanpintaishu').value = 1;
		
			buy_num = 1;
			
		}
	}
	
	$('zongjia').innerHTML = buy_num * shop_price ;
	
	/*----------------快递----------------------------*/
	
	if (buy_num < 2)
	{
		if (obj.kuaidi[0].checked == true)
		{
			
			$('yunfei').innerHTML = $('kuaidi_feiyong').value = 15;
			
			$('zongjia').innerHTML = $('chanpin_zongjia').value = buy_num * shop_price + 15;
			
		}
		else if (obj.kuaidi[1].checked == true)
		{
			$('yunfei').innerHTML = $('kuaidi_feiyong').value = 35;
			
			$('zongjia').innerHTML = $('chanpin_zongjia').value = buy_num * shop_price + 35;
			
		}
	}
	else
	{
		
		$('yunfei').innerHTML = $('kuaidi_feiyong').value = 0;	
		
		$('zongjia').innerHTML = $('chanpin_zongjia').value = buy_num * shop_price;
		
	}
	
	$('is_js').value = 1;
	
}

function checkform()
{
	
	if ($('is_js').value == 0)
	{
		js_money();	
	}
	
	/*-----------------验证表单---------------*/
	
	if ($('name').value == '' || $('name').value.length<2)
	{
		
		alert('请输入您的姓名，方便我们更好的为您服务！');	
		
		$('name').focus();
		
		return false;
		
	}
	if ($('address').value == '' || $('address').value.length<6)
	{
		
		alert('请输入您的具体地址，方便您更快的收到货物！');
		
		$('address').focus();
		
		return false;
		
	}
	if ($('mobile').value == '' || $('mobile').value.length<8)
	{
		
		alert('请输入您的联系方式，方便我们更好的为您服务！');
		
		$('mobile').focus();
		
		return false;
		
	}
	alert('感谢您的提交，我们会经快给您发货，如有疑问，请随时致电，全国免费服务热线400-666-7873 ^_^');
}