 <!--Script to check user has entered data into the form correctly:-->		
 
<!--Function to check email address inputted has the @ and . in the right place. e.g. name@domain.com-->
function checkEmail(emailString)
{
	atPos = emailString.indexOf("@");
	dotPos = emailString.lastIndexOf(".");
	emailLength = emailString.length;
	
	<!--check if email string is empty-->
	if (emailString == "")
	{
		return false;
	}
	
	<!--check if @ or . are missing-->
	if (atPos == -1 || dotPos == -1)
	{
		return false;
	}
	
	<!--check if . is before @-->
	if (atPos > dotPos)
	{
		return false;
	}
	
	<!--check if @ is right next to .-->
	if (dotPos - atPos == 1)
	{
		return false;
	}
	
	<!--check if @ is the first character-->
	if (atPos == 0)
	{
		return false;
	}
	
	<!--check if . is the last character-->
	if (dotPos == emailLength-1)
	{
		return false;
	}
}

function checkForm()
{
	with(window.document.contactForm)
	{
		var inputs = new Array();
		inputs[0] = name;
		inputs[1] = email;
		inputs[2] = comment;
		var email_valid = 0;										 		
		
		<!--Provide hints if user has not entered data into the form-->
		<!--Works through the if statements starting at the bottom-most input, so that the focus will go to the uppermost input that has not been entered-->					
		if(comment.value=="")
		{
			document.getElementById('contactCommentHint').style.visibility = "visible";
		}
		else {
			document.getElementById('contactCommentHint').style.visibility = "hidden";
		}
		
		if(checkEmail(email.value)== false)
		{
			document.getElementById('contactEmailHint').style.visibility = "visible";
			email.focus();
			email_valid = 0;
		}
		else {
			document.getElementById('contactEmailHint').style.visibility = "hidden";
			email_valid = 1;	
		}
		
		if(name.value=="")
		{
			document.getElementById('contactNameHint').style.visibility = "visible";
			name.focus();
		}
		else {
			document.getElementById('contactNameHint').style.visibility = "hidden";
		}
		
		<!--Don't allow submission is user has not inputted all required values into the form-->
		if(name.value=="" || email.value=="" || comment.value=="" || email_valid==0)
		{
		return false;
		}
	}
}