function CheckInput()
{
  if(document.getElementById('txtName').value=='')
  {
    alert('用户名不能为空');
    document.getElementById('txtName').focus();
    return false;
  }  
  if(document.getElementById('txtPassword').value=='')
  {
    alert('密码不能为空');
    document.getElementById('txtPassword').focus();
    return false;
  } 
  
  if(document.getElementById('Vcode').value=='')
  {
    alert('验证码不能为空');
    document.getElementById('Vcode').focus();
    return false;
  } 
  return true;
}

function openwin(url)
{
    var windowX =  (window.screen.width - 300) / 2  ;
    var windowY =  (window.screen.height - 200) / 2 ;
    window.open(url,"","width=451,height=242,location=no,menubar=no,scrollbars=no,resizable=no,top="+windowY+",left="+windowX);
}

function loadImg()
{
    document.getElementById('Image1').src="SPL_ValidateCode.aspx?"
}