String.prototype.trim = function() {
	return this.replace(/^\s+|\s+$/g, '');
}

function validateNotBlank(field) {
	if (typeof field == 'undefined') return false;
		
	return (field.value.trim() != '');
}

function validatePhoneNumber(field) {		
	if (typeof field == 'undefined') return false;
	return ((/(6|9)[0-9]{8}/.test(field.value)));
}

function validateEmail(field) {
	if (typeof field == 'undefined') return false;
	var regx = /^(\w+([\.-_]?\w+)*@\w+([\.-_]?\w+)*\.[a-zA-Z]{2,4})$/;
	return regx.test(field.value);
}

function validateCheckBox(field) {
	if (typeof field == 'undefined') return false;
	return field.checked;
}