function checkForm( form ){

    //lets check if Name text field is empty. This field has name "name".
    if( isEmpty( form.bname ) ){
        alert( 'Name is a required field!' );
        return false;
    }
    if( isEmpty( form.baddr1 ) ){
        alert( 'Address is a required field!' );
        return false;
    }    
    if( isEmpty( form.bcity ) ){
        alert( 'City is a required field!' );
        return false;
    }
    //if( isEmpty( form.bzip ) ){
      //  alert( 'Zip Code is a required field!' );
        //return false;
    //}    
    if( isEmpty( form.cctype ) ){
        alert( 'Credit Card Type is a required field!' );
        return false;
    }     
    if( isEmpty( form.cardnumber ) ){
        alert( 'Credit Card Number is a required field!' );
        return false;
    }     
    if( isEmpty( form.expmonth ) ){
        alert( 'Credit Card expire month date is a required field!' );
        return false;
    }     
    if( isEmpty( form.expyear ) ){
        alert( 'Credit Card expire year is a required field!' );
        return false;
    }     

        
    //now let's check if email is correct. This field name is "email"
    if( notValidEmail( form.email ) ){
        alert( 'That email address is not valid!' );
        return false;
    }
    
    //now let's check if checkbox is checked. This field name is "subscribe"
    //if( notChecked( form.subscribe ) ){
    //    alert( 'Subscribe box is required field!' );
    //    return false;
    //}

    return true;
} 

function isEmpty( str){
    strRE = new RegExp( );
    strRE.compile( '^[\s ]*$', 'gi' );
    return strRE.test( str.value );
} 

function notValidEmail( str ){
    mailRE = new RegExp( );
    mailRE.compile( '^[\._a-z0-9-]+@[\.a-z0-9-]+[\.]{1}[a-z]{2,4}$', 'gi' );
    return !(mailRE.test( str.value ));
} 

function notChecked( box ){
    if( box.checked ){
        return true;
    }
    else{
        return false;
    }
}