function validate()
{
    
	if(document.contact_us.fname.value=="")
	{
		alert("Please enter your name.");
		document.contact_us.fname.focus();
		return false;
		
	} else if(document.contact_us.email.value == "")
	{
		alert("Please specify your email address.");
		document.contact_us.email.focus();
  	return false;
	} else if (!checkEmail(document.contact_us.email.value))
	{
		alert("The specified email address seems to be invalid.")
   	document.contact_us.email.select();
	  return false;
	}
}

function checkEmail(email) {
  var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
  return reg.test(email);
}