function is_valid_email(email) {
   var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
   
   return reg.test(email);
}

function is_valid_zipcode(zipcode) {  
    var reg = /^([0-9]{5})$/;
    
    return reg.test(zipcode); 
}

function is_empty(val) {
	val = jQuery.trim(val);
	if ( val.length == 0 ) {
		return true;
	}
	return false;
}

function is_valid_phonenumber(phonenumber) {
    var trimmed = phonenumber.replace(/[^0-9]/g,'');
	var firstthree = phonenumber.substr(0,3);
	var firstnumber = phonenumber.substr(0,1);
	var secondthree = phonenumber.substr(3,3);
	var lasteight = phonenumber.substr(3,7);
	var completeflush = phonenumber.substr(0,10);
    if ( trimmed.length != 10 ) {
        return false;
	}
	if ( firstthree == '888' || firstthree == '887' || firstthree == '886' || firstthree == '883' || firstthree == '881' || firstthree == '877' || firstthree == '866' || firstthree == '800' || firstthree == '900' || firstthree == '555' ) {
		return false;
	}
	if ( secondthree == '555' ) {
		return false;
	}
	if ( lasteight == '8675309' ) {
		return false;
	}
	if ( firstnumber == '1' || firstnumber == '0' ) {
		return false;
	}
	if ( completeflush == '0000000000' || completeflush == '1111111111' || completeflush == '2222222222' || completeflush == '3333333333' || completeflush == '4444444444' || completeflush == '5555555555' || completeflush == '6666666666' || completeflush == '7777777777' || completeflush == '8888888888' || completeflush == '9999999999' ) {
		return false;
	}
	
	return true;
}

function is_valid_ssn(ssn) {
    var reg = /^([0-9]{3})-([0-9]{2})-([0-9]{4})$/;
    
    return reg.test(ssn);
}

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