/*--------
Add default prompt for input fields (defined by jQuery selector),  make it dissapear on click and reappear on blur .
Disabled, when non-default data present.
Default prompt defined in 'alt' attribute of the input field.
--------*/
function input(jQuerySelector) {
	var field = $(jQuerySelector);
	var prompt = field.attr('alt');
		
	if (field.val() == '')
		field.val(prompt);
		
	field.blur(function() {
		if (field.val() == '')
			field.val(prompt);
	});
}
/*--------
Disable submit for form (defined by jQuery selector) with empty (or default)  input
--------*/
function disable_empty (jQuerySelector) {
	var form = $(jQuerySelector);
	var field = form.find('input');
	form.submit(function() {
		return !(field.val() == '' || field.val() == field.attr('alt'));
	});
}
/*--------
Disable submit for form (defined by jQuery selector) without a checked  radio element
--------*/
function disable_unchecked (jQuerySelector) {
	var radioForm = $(jQuerySelector);
	radioForm.submit(function() {
		if (radioForm.find('input[type=radio]').length > 0)
			return radioForm.find(":checked").length > 0;
		else
			return true;
	});
}

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