JQUERY Email validation

With out jquery plugin easily we can validate an Email

var emailReg = /^([\w-\.]+@([\w-]+\.)+[\w-]{2,4})?$/;

var emailaddressVal = jQuery('#email').val();

if( jQuery('#email').val() ==""){

alert( 'Please Enter Valid Email' );

}

Numeric validations

else if( jQuery('#rphone').val() !=""){

var orignalValue = jQuery('#rphone').val();

orignalValue=orignalValue.replace(/([^0-9].*)/g, "");

if( orignalValue == ""){

alert( "" );

}else{

return true;

}

}