//Feedback Validation Form JavaScript Document

//function to validate email address string
function validateEmail(str)
{
	var at="@";
	var dot=".";
	var lat=str.indexOf(at);
	var lstr=str.length;
	var ldot=str.indexOf(dot);
	if (str.indexOf(at)==-1){ return false; }
	
	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr)	{ return false; }
	
	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){ return false; }
	
	if (str.indexOf(at,(lat+1))!=-1){ return false;}
	
	if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){ return false;}
	
	if (str.indexOf(dot,(lat+2))==-1){return false;}
	
	if (str.indexOf(" ")!=-1){ return false;}
	return true;
}

function checkFields()
{
	var name 	= document.feedbackForm.name.value;
	var email 	= document.feedbackForm.email.value;
	var message	= document.feedbackForm.message.value;  
	if(name == ""){
		alert("Please enter your Name.");
		document.feedbackForm.name.focus();
		return false;
	}
	if(email == ""){
		alert("Please enter your Email Address.");
		document.feedbackForm.email.focus();
		return false;
	}
	
	if(!validateEmail(email)){
		alert("Please enter a valid Email Address.");
		return false;
	}
	
	if(message == ""){
		alert("Please enter your Message.");
		document.feedbackForm.message.focus();
		return false;
	}
}