function sendinfo() {
  var name = document.getElementById("name");
  var fax = document.getElementById("fax");
  var request = document.getElementById("request");
  var company = document.getElementById("company");
  var phone = document.getElementById("phone");
  var email = document.getElementById("email");
  var address = document.getElementById("address");
  
  if (name.value == "") {
    alert("Please enter the name of contact person.");
    name.focus();
    exit();
  }
  
  if (name.value.length < 5) {
    alert("The minium length of name is 5 characters.");
    name.focus();
    exit();
  }
  
  if (name.value.length > 20) {
    alert("The name cannot exceed 20 characters.");
    name.focus();
    exit();
  }
  

  if (fax.value == "") {
    alert("Please enter your fax number.");
    fax.focus();
    exit();
  }
  
  if (fax.value.length < 5) {
    alert("The minium length of fax number is 5 characters.");
    fax.focus();
    exit();
  }
  
  if (fax.value.length > 20) {
    alert("The fax number cannot exceed 20 characters.");
    fax.focus();
    exit();
  }
  
  
  if (request.value == "") {
    alert("Please specify your request.");
    request.focus();
    exit();
  }
  

  if (request.value.length > 150) {
    alert("The request cannot exceed 150 characters.");
    request.focus();
    exit();
  }
  
  
  if (company.value == "") {
    alert("Please enter your company name.");
    company.focus();
    exit();
  }
  
  if (company.value.length < 5) {
    alert("The minium length of company name is 5 characters.");
    company.focus();
    exit();
  }
  
  if (company.value.length > 40) {
    alert("The company name cannot exceed 40 characters.");
    company.focus();
    exit();
  }
  
   
  if (phone.value == "") {
    alert("Please enter a phone number.");
    phone.focus();
    exit();
  }
  
  if (phone.value.length < 5) {
    alert("The minium length of phone number is 5 characters.");
    phone.focus();
    exit();
  }
  
  if (phone.value.length > 20) {
    alert("The phone number cannot exceed 20 characters.");
    phone.focus();
    exit();
  }
  
     
  if (email.value == "") {
    alert("Please enter an email address.");
    email.focus();
    exit();
  }
  
  if (email.value.indexOf("@") == -1) {
    alert("Please enter a valid email address.");
    email.focus();
    exit();
  }
  
  if (email.value.length > 40) {
    alert("The email address cannot exceed 40 characters.");
    email.focus();
    exit();
  }

  if (address.value == "") {
    alert("Please enter your address.");
    address.focus();
    exit();
  } 

  if (address.value.length > 100) {
    alert("The address cannot exceed 100 characters.");
    address.focus();
    exit();
  }
 
  document.contactusform.submit(); 
}

function clearform() {
  document.contactusform.reset();
  document.contactusform.name_t.focus();
}