function checkcompany()
{
    var comp=document.getElementById("ctl00_ContentPlaceHolder1_txtCommpany").value;
    var spancompany=document.getElementById("company");
    if(comp=="")
    {
        spancompany.innerHTML="<font color='red'>公司名不能为空!</font>";
        return false;
    }
    else
    {
        spancompany.innerHTML="<font color='green'>√</font>";
        return true;
    }
}

function checklinkman()
{
 var link=document.getElementById("ctl00_ContentPlaceHolder1_txtLinkMan").value;
 var spanlinkman=document.getElementById("linkman");
 if(link=="")
 {
  spanlinkman.innerHTML="<font color='red'>联系人不能为空!</font>";
  return false;
 }
 else
 {
  spanlinkman.innerHTML="<font color='green'>√</font>";
  return true;
 } 
}

function checktel()
{
 var tel=document.getElementById("ctl00_ContentPlaceHolder1_txtMobile").value;
 var spantel=document.getElementById("mobile");
 if(tel!="")
 {
     var reg = /^[0-9]{11}$/i;
     if(!reg.test(tel))
        {
            spantel.innerHTML="<font color='red'>请正确填写手机号码!</font>";
            return false;
        }
     else
     {
      spantel.innerHTML="<font color='green'>√</font>";
      return true;
     }
 }
 else
 {
     spantel.innerHTML="<font color='red'>移动电话不能为空!</font>";
     return false;
 }
}

function checkcontent() 
{
 var cont=document.getElementById("ctl00_ContentPlaceHolder1_txtContent").value;
 var spancontent=document.getElementById("content");
 if(cont=="")
 {
  spancontent.innerHTML="<font color='red'>留言内容不能为空!</font>";
  return false;
 }
 else if(cont.length>200)
 {
  spancontent.innerHTML="<font color='red'>留言内容字数在200字之内!</font>";
  return false;
 }
 else
 {
  spancontent.innerHTML="<font color='green'>√</font>";
  return true;
 } 
}
function checkall()
{
    if(checkcompany()&&checklinkman()&&checktel()&&checkcontent())
    {
        return true;
    }
    return false;
}

function checkuser()
{
    var uname=document.getElementById("ctl00_ContentPlaceHolder1_txtUserName").value;
    var spanname=document.getElementById("username");
    if(uname=="")
    {
        spanname.innerHTML="<font color='red'>*</font>";
        return false;
    }
    else
    {
        spanname.innerHTML="<font color='green'>√</font>";
        return true;
    }
}
function checkpwd()
{
    var pwd=document.getElementById("ctl00_ContentPlaceHolder1_txtPwd").value;
    var spanpwd=document.getElementById("userpwd");
    if(pwd=="")
    {
        spanpwd.innerHTML="<font color='red'>*</font>";
        return false;
    }
    else
    {
        spanpwd.innerHTML="<font color='green'>√</font>";
        return true;
    }
}
function checklogin()
{
    if(checkuser()&&checkpwd())
    {
        return true;
    }
    return false;
}