function isBlank(tValue) {
	
	if (tValue == "") {
		
		return false;
	} else {
		
		return true;	
	}
};

function chkContactForm()
{
	var isBlankMessage = "This field is required!";
	
	if(!isBlank( document.getElementById('firstname').value )){
			alert(isBlankMessage);
			document.getElementById('firstname').focus();
			return false;
		}
	if(!isBlank( document.getElementById('lastname').value )){
			alert(isBlankMessage);
			document.getElementById('lastname').focus();
			return false;
		}
	if(!isBlank( document.getElementById('email').value )){
			alert(isBlankMessage);
			document.getElementById('email').focus();
			return false;
		}
	if(!isBlank( document.getElementById('phone').value )){
			alert(isBlankMessage);
			document.getElementById('phone').focus();
			return false;
		}
	if(document.getElementById('checkin_year').value == 0 || document.getElementById('checkin_month').value == 0 || document.getElementById('checkin_day').value == 0){
			alert(isBlankMessage);
			document.getElementById('checkin_year').focus();
			return false;
		}
	if(document.getElementById('checkout_year').value == 0 || document.getElementById('checkout_month').value == 0 || document.getElementById('checkout_day').value == 0){
			alert(isBlankMessage);
			document.getElementById('checkout_year').focus();
			return false;
		}
		
};