function validateEmail(str) {

  eMailRegExp = /^[a-zA-Z]\w*(\.\w+)*(-\w+)*(\.\w+)*@(\w+(-\w+)*\.)+[a-zA-Z]{2,9}$/
  pass = eMailRegExp.test(str);
  if (!pass){
    return false;
  }
  else {
    return true;
  }  
}

function validateContactUs(theForm){

		if (theForm.name.value == ""){
			alert("Please enter your name");
			theForm.name.focus();
			return false;
		}

		if (theForm.email.value == ""){
			alert("Please enter your email address");
			theForm.email.focus();
			return false;
		}

		if (!validateEmail(theForm.email.value)) {
			alert("Please enter a valid email address");
			theForm.email.focus();
			return false;
		}

		if (theForm.message.value == ""){
			alert("Please enter your message");
			theForm.message.focus();
			return false;
		}

		return true;
}