function isEmpty(text){
	if(text.value.length == 0)
	return true;
	for(var i=0;i<text.value.length;i++){
		var ch = text.value.charAt(i);
		if(ch!=' ' && ch != '\t')
		return false;
	}return true
}

function isEmail(text){
	if(text.value.length == 0)
	return false;
	if(text.value.indexOf("@") == -1 || text.value.indexOf(".") == -1)
	return false;
	return true;
}
function validateForm(f) {
	if(isEmpty(f.fullname)){
		alert("Please provide your name.");
		f.fullname.focus();
	}
	else if(isEmpty(f.email) || !isEmail(f.email)){
		alert("Please enter a valid e-mail address.");
		f.email.focus();
		f.email.select();
	}
	else if (isEmpty(f.message)) {
		alert("Please provide a message.");
		f.message.focus();
	}
	else if (isEmpty(f.verify) || !(f.verify.value=="4")) {
		alert("You must provide the right answer for the math equation, 2+2");
		f.verify.focus();
		f.verify.select();
	}
	else
	return true;
	return false;
}