function POList_submit() {	
	counter = 0;
	if(POList_Form.POList_selectOrderID == null){
	  alert("列表中没有订单可执行操作！");
	  return false;
	  }
	if(POList_Form.POList_selectOrderID.length == null){
		if(POList_Form.POList_selectOrderID.checked == true){
			counter += 1;
		}
	}else{
		for (var i=0; i<POList_Form.POList_selectOrderID.length; i++){		
			if (POList_Form.POList_selectOrderID[i].checked == true){
				counter += 1;			
			}
		}
	}

	if(counter < 1){
		alert("请选择订单");                
		return;
	}

	if(POList_Form.POList_action.value=="delete"){		
		if(!confirm("确定删除选中订单？")){
			return;
		}
	}

	if(POList_Form.POList_action.value=="cancel"){		
		if(!confirm("确定取消选中订单？")){
			return;
		}
	}

	if(POList_Form.POList_action.value=="merge"){		
		if(counter < 2){
			alert("请选择两个或两个以上的订单");                
			return;
		}
		if(!confirm("合并后的订单中发票项与备注项,默认取选中订单中的第一个订单的,你确定合并选中订单？")){
			return;
		}
	}
   
	POList_Form.submit();
}

function POList_search()
{				
	 if(POList_SearchForm.POList_startDate.value!="")
		{  
		var isDate1=isDate(POList_SearchForm.POList_startDate.value,true);	
		if(isDate1==false)
			{	 
			alert("请输入正确的起始日期格式！"); 
			return false;
       			}
       		}
       	if(POList_SearchForm.POList_endDate.value!="")
		{  
		var isDate2=isDate(POList_SearchForm.POList_endDate.value,true);	
		if(isDate2==false)
			{	 
			alert("请输入正确的结束日期格式！"); 
			return false;
       			}
       		}						
	
	if(!compareDate(POList_SearchForm.POList_startDate.value, POList_SearchForm.POList_endDate.value))
	{
		alert("起始日期不能大于结束日期");
		return false;
	}
	
	return true;
}

function POList_reset()
{
	POList_SearchForm.POList_orderID.value = "";
	POList_SearchForm.POList_startDate.value = "";
	POList_SearchForm.POList_endDate.value = "";					
}