function isNull(input) {

	if (!(input.length == 0)) {
		return true;
    }
	else {
		return false;
	}
}


function isNumeric(input)
{
	if (input.match(/^[0-9]*$/)) { 
		return true; 
	} 
	else { 
		return false; 
	}	
}


function isEMail(input)
{
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (filter.test(email)) { return true; } else { return false; }
}


function isPhone(input)
{
	if (input.match(/^\(*\d{3}\)*-*\s*\d{3}-*\d{4}/)) { 
		return true; 
	} 
	else { 
		return false; 
	}	
}

function confirmEmail(email1, email2) {

	if (email1 == email2) {
		return true;
	}
	else {
		return false;
	}
}

function showError(field, error) {

	document.getElementById(field).innerHTML = "<div align='center'><font color='red'>" + error + "</font></div>";
	
}

function clearError(field) {

	document.getElementById(field).innerHTML = "";
	
}