function updateTips(t) {
		tips.text(t).effect("highlight",{},1500);
	}

	function checkLength(obj, n,min,max) {		

		obj.focus(function () {
        	obj.removeClass('ui-state-error');
    	});	
    	
		if ( obj.val().length > max || obj.val().length < min ) {
			obj.addClass('ui-state-error');
//			o.attr("hint", n);
			obj.addblur();
			return false;
		} else {
			obj.removeClass('ui-state-error');
			return true;
		};			
	};
	
	function same(o,p) {
		if ( o.val() != p.val() ) {
			o.addClass('ui-state-error');
			//updateTips("passwords do not match");
			return false;
		} else {
			o.removeClass('ui-state-error');
			return true;
		}
	}	
		
	function checkRegexp(o,regexp,n) {
		if ( !( regexp.test( o.val() ) ) ) {
			o.addClass('ui-state-error');
//			o.attr("hint", n);
			o.addblur();
			return false;
		} else {
			o.removeClass('ui-state-error');
			return true;
		}
	}

/********* specific field validation ***************/

	function cityRadiusValidate( form ) {
		var city   = form.find('.destination');
		var radius = form.find('.radiusbox');
		
		var bValid = true;
		
		bValid = bValid && checkLength(city, "city",4,80);
		bValid = bValid && checkLength(radius, "radius",1,3);
	
		bValid = bValid && checkRegexp(city,/^(['a-zA-Z_\-\s])+$/,"city name field only allow : a-z");
		bValid = bValid && checkRegexp(radius,/^([0-9])+$/,"radius field only allow : 0-9");
	
		if( bValid )
			return true;
		else
			return false;
	};