// JavaScript Document

function contactValidation(contactForm) { 	

	if (contactForm.name.value == '') {
		changeText(true, "  Please enter your name");
		contactForm.name.focus();
		return false;
	}
	
	if (contactForm.surname.value == '') {
		changeText(true, "  Please enter your surname");
		contactForm.surname.focus();
		return false;
	}
	
	if (contactForm.tel.value == '') {
		changeText(true, "  Please enter your telephone number");
		contactForm.tel.focus();
		return false;
	}
	
	if (!validNum(contactForm.tel.value)) {
		changeText(true, "  Please enter a valid telephone number");
		contactForm.tel.focus();
		return false;
	}
	

	if (contactForm.email.value == '') {
		changeText(true, "  Please enter your email address");
		contactForm.email.focus();
		return false;
	}
	
	if (!validEmail(contactForm.email.value)) {
		changeText(true, "  Please enter a valid email address");
		contactForm.email.focus();
		return false;
	}
	
	if (contactForm.enquiry.value == '') {
		changeText(true, "  Please enter your query");
		contactForm.enquiry.focus();
		return false;
	}
	

	return true;

}

function changeText(error, text) {
	document.getElementById('awswer-container').innerHTML = text;
	
	if (error){
		document.getElementById('awswer-container').className = 'wrong';
	}else{
		document.getElementById('awswer-container').className = 'right';
	}
}

// checks for valid telephone characters

function validNum(telno) {

	var pattern = "0123456789+-)(. ";
	var i = 0;

	do {
		var pos = 0;
		for ( var j = 0 ; j < pattern.length ; j++ )
			if ( telno.charAt(i) == pattern.charAt(j) )
				pos = 1;
		i++;
	}

	while ( pos == 1 && i < telno.length )

	if ( pos == 0 ) return false;
	return true;

}



// check email address pattern
function validEmail(addr) {

	var regex = /^[a-zA-Z0-9._-]+@([a-zA-Z0-9.-]+\.)+[a-zA-Z0-9.-]{2,4}$/;
	if ( !regex.test(addr) ) {
		return false;
	}
	return true;
}