function validateField(fieldName){
    var jField = jQuery('#' + fieldName);
	
    if(jField.val() == document.getElementById(fieldName).defaultValue){
        isValid = false;
        jField.addClass('contact-form-item-error');
    } else {
        jField.removeClass('contact-form-item-error');
    }		
}

function validateNumeric(fieldName){
    var jField = jQuery('#' + fieldName);
    var string = removeSpaces(jField.val());
	
    if(isNaN(string)){
        isValid = false;
        jField.addClass('contact-form-item-error');			
    } else {
        jField.removeClass('contact-form-item-error');		
    }
}

function removeSpaces(string) {
    return string.split(' ').join('');
}