// focus form field if empty
function focusField (elementid) {
   $('#'+elementid).focus();
}

$.fn.disableAndChangeOnSubmit = function(elementid,text){
	
	// Makes sure button is enabled at start
	$('#'+elementid).removeAttr('disabled');
	
	// Disable and Change Text on submit
	$(this).submit(function(){$('#'+elementid).attr('disabled',true).addClass('ui-state-disabled').attr('value',text);});
	
	return this;

};