Jquery: Placeholder ie polyfill

gistfile1

  //Placeholder funcion
(function($){$.fn.extend({placeholder:function(){return this.each(function(){$(this).focus(function(){if($(this).val()==$(this).attr("placeholder")){$(this).val("");}}).blur(function(){if($(this).val()==""){$(this).val($(this).attr("placeholder"));}}).val($(this).attr("placeholder"));});}});})(jQuery); // Si es IE aplicar, colocar dentro del ready 
if ($.browser.msie) {
        $('input[placeholder]').placeholder();
    }