//function to check valid email address
var yourEmailCheck;
var friendEmailCheck;
function checkYourEmail(yourEmail){	
  validRegExp = /^[^@]+@[^@]+.[a-z]{2,}$/i; 
  document.getElementById(yourEmail.id).className = "hilibg";
   // search email text for regular exp matches   
	if (yourEmail.value.search(validRegExp) == -1 || yourEmail.value == "") {
	  alert('A valid e-mail address is required.\nPlease amend and retry');	
	  yourEmailCheck = false;
	  return false;
	} else {		
		yourEmailCheck = true;
		document.getElementById(yourEmail.id).className = "";	
	}
    return true; 
}

function checkFriendEmail(friendEmail){	
  validRegExp = /^[^@]+@[^@]+.[a-z]{2,}$/i; 
  document.getElementById(friendEmail.id).className = "hilibg";
   // search email text for regular exp matches   
	if (friendEmail.value.search(validRegExp) == -1 || friendEmail.value == "") {
	  alert('A valid e-mail address is required.\nPlease amend and retry');	
	 friendEmailCheck = false
	  return false;
	} else {		
		friendEmailCheck = true;
		document.getElementById(friendEmail.id).className = "";	
	}
    return true; 
}

function allowSubmit() {	
	if(document.getElementById('y_name').value == "") {
		alert("Please enter your name");		
		return false;
	}
	
	if(document.getElementById('y_email').value == "") {
		alert("Please enter your email");	 
		return false;
	}
	
	if(document.getElementById('f_name').value == "") {
		alert("Please enter your friend's name");	 
		return false;
	}
	
	if(document.getElementById('f_email').value == "") {
		alert("Please enter your friend's email");	 
		return false;
	}
	
	
	
	closeDivs();
	
}

function showForm() {
	var showform = document.getElementById("content");
	
	if(showform.className == "hide") {
		showform.className = 'show';
	} else {
		showform.className = 'hide';	
	}
}

function closeDivs() {
	document.getElementById("content").className = 'hide';
	document.getElementById("feedBack").className = 'show';
}