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// A Standard Set of Rules and Descriptive Error Messages for Building a Basic Validation Engine

var errMsg = {
	
	// Checks for when a specified field is required
	required: {
		msg: "This field is required.",
		test: function(obj, load) {
			// Make sure that no text was entered in the field and that
            // we aren't checking on page load (showing 'field required' messages
            // would be annoying on page load)
			return obj.value.length > 0 || load || obj.value == obj.defaultValue;
		}
	},

	// Makes sure that the field is a valid email address
	email: {
		msg: "Not a valid email address.",
		test: function(obj) {
			// Make sure that something was entered and that it looks like an email address
			return !obj.value ||
				/^[a-z0-9_+.-]+\@([a-z0-9-]+\.)+[a-z0-9]{2,4}$/i.test( obj.value );
		}
	},

	// Makes sure that the field is a phone number and auto-formats the number if it is one
	phone: {
		msg: "Not a valid phone number.",
		test: function(obj) {
			// Check to see if we have something that looks like a valid phone number
			var m = /(\d{3}).*(\d{3}).*(\d{4})/.exec( obj.value );

			// If it is, seemingly, valid - force it into the specific
            // format that we desire: (123) 456-7890
            if ( m ) obj.value = "(" + m[1] + ") " + m[2] + "-" + m[3];

            return !obj.value || m;
		}
	},

	// Makes sure that the field is a valid MM/DD/YYYY date
	date: {
		msg: "Not a valid date.",
		test: function(obj) {
			// Make sure that something is entered, and that it looks like a valid MM/DD/YYYY date
			return !obj.value || /^\d{2}\/\d{2}\/\d{2,4}$/.test(obj.value);
		}
	},

	// Makes sure that the field is a valid URL
	url: {
		msg: "Not a valid URL.";
		test: function(obj) {
			// Make sure taht some text was entered, and that it's no the default http:// text
			return !obj.value || obj.value == 'http://' ||
				// Make sure that it looks like a valid URL
    			/^https?:\/\/([a-z0-9-]+\.)+[a-z0-9]{2,4}.*$/.test( obj.value );
		}
	}

};