// JavaScript Document
function checkFeedback1 (form) {
	
	if (form.fname.value == "") {
		alert ("Please enter your first name");
		form.fname.focus();
		return false;
	}//end of if
	
	if (form.lname.value == "") {
		alert ("Please enter your last name");
		form.lname.focus();
		return false;
	}//end of if
	
	if (form.email.value == "") {
		alert ("Please enter your email address");
		form.email.focus();
		return false;
	}//end of if
	
	if (!isEmail(form.email.value)) {
		form.email.value="";
    	alert("Please enter an appropiate email address in the form: yourname@yourdomain.com");
    	form.email.focus();
    	return false;
  	}//end of if
	
	if (form.subject.value == "") {
		alert ("Please enter your feedback subject");
		form.subject.focus();
		return false;
	}//end of if
	
	if (form.content.value == "") {
		alert ("Please write your feedback content");
		form.content.focus();
		return false;
	}//end of if
	
	return true;
}//end of checkFeedback1()

function isEmail(email) {
  email = email.toLowerCase();

  if (email.indexOf(" ")>0) {
    return false;
  }//end of if

  if (email.indexOf("@")<0) {
    return false;
  }//end of if
  
  if (email.indexOf(".")<0) {
    return false;
  }//end of if  
  
  return true;
}//end of isEmail()