function checkName(strng) {
 	var error = "";
 	if (strng == "") {
  	  error = "You didn't enter your name.\n\n";
 	}
	return error;
 }
 
function checkForm(strng) {
 	var error = "";
 	if (strng == "") {
  	  error = "You forgot to fill in at least one form!\n\n";
 	}
	return error;
 }
 
function checkEmail(strng) {
 	var error = "";
 	if (strng == "") {
  	  error = "You didn't enter your e-mail address.\n\n";
 	}
	return error;
 }
 
function checkSubject(strng) {
 	var error = "";
 	if (strng == "") {
  	  error = "You didn't enter a subject.\n\n";
 	}
	return error;
 }
 
function checkText(strng) {
 	var error = "";
 	if (strng == "") {
  	  error = "You didn't enter a message.\n\n";
 	}
	return error;
 }