function checkone()
{
   if(document.getElementById("txtName").value=="")
   {
     alert("请输入姓名和驾照档案号（驾驶证号）");
     document.getElementById("txtName").focus();
     return false;
   }
   
   document.getElementById("fromone").submit();
}

function checktwo()
{
   if(document.getElementById("LicenseTxt").value=="" || document.getElementById("VIN").value=="")
   {
     alert("请输入车牌号码和VIN编码");
     document.getElementById("LicenseTxt").focus();
     return false;
   }
   
   document.getElementById("fromtwo").submit();
}

function checkthree()
{
   if(document.getElementById("txtDname").value=="")
   {
     alert("请输入姓名和驾照档案号（驾驶证号）");
     document.getElementById("txtDname").focus();
     return false;
   }
   
   document.getElementById("formthree").submit();
}


function checkfour()
{
   if(document.getElementById("txtUName").value=="")
   {
     alert("请输入姓名和驾照档案号（驾驶证号）");
     document.getElementById("txtUName").focus();
     return false;
   }
   
   document.getElementById("fromfour").submit();
}