function contact_us(){
	
	var name = document.getElementById('name');
	var email = document.getElementById('email');
	var phone = document.getElementById('phone');
	var reason = document.getElementById('reason');
	var message = document.getElementById('message');
	
	var alphabet = /^[a-zA-Z ]+$/;
	var number = /^[0-9 ]+$/;
	var emailRegEx=/^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	
	if(name.value=="" || name.value==null){
	  alert("Please enter your name");
	  name.focus();
	  return false;
	}
	else if(!name.value.match(alphabet))
	{
	 alert("Name allows only alphabets");
	 name.focus();
	 return false;
	}
	if(email.value=="" || email.value==null){
	  alert("Please enter your email address");
	  email.focus();
	  return false;
	}
	else if(!email.value.match(emailRegEx))
	{
	 alert("Please enter your valid email address");
	 email.focus();
	 return false;
	}
	if(phone.value!="" && !phone.value.match(number))
	{
	 alert("Phone number accepts only numbers and spaces");
	 phone.focus();
	 return false;
	}
	if(reason.value=="")
	{
	 alert("Please select the subject");
	 reason.focus();
	 return false;
	}
	if(message.value=="" || message.value==null)
	{
	 alert("Please enter the message");
	 message.focus();
	 return false;
	}
 return true;	
}