function  validateContactUs(){
	
	var root = document.contactus;
	
	var name = root.name;
	var email = root.email;
	var subject = root.subject;
	var message = root.message;
	
	if(name.value==''){
		alert("Please enter your name.");
		name.focus();
		return false;
	}
	if(email.value==''){
		alert("Please enter your email.");
		email.focus();
		return false;
	}
	var pattern = /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,4})+$/;
	var flag2 = email.value.match(pattern);
	if(!flag2)
	{
		alert("Please enter a valid E-mail address.");
		email.select();
		return false;
	}
	if(subject.value==''){
		alert("Please enter the subject.");
		subject.focus();
		return false;
	}
	if(message.value==''){
		alert("Please enter your message.");
		message.focus();
		return false;
	}
	return true;
}