function clearText(field){

    if (field.defaultValue == field.value) field.value = '';
    else if (field.value == '') field.value = field.defaultValue;

}


$.fn.extend({
	dropIn: function(speed, callback){
		var $t = $(this);

		if($t.css("display") == "none"){
			eltop = $t.css('top');
			elouterHeight = $t.outerHeight(true);

			$t.css({ top: -elouterHeight, display: 'block' })
				.animate({ top: eltop },speed,'swing', callback);
		}
	}
});
	
$.prompt('Please use a valid password and or user name',{ show:'dropIn' });