ie8 html5 placeholder (jquery)

placeholder.js

$('input[placeholder]').each(function(){  
        
        var input = $(this);        
        
        $(input).val(input.attr('placeholder'));
                
        $(input).focus(function(){
             if (input.val() == input.attr('placeholder')) {
                 input.val('');
             }
        });
        
        $(input).blur(function(){
            if (input.val() == '' || input.val() == input.attr('placeholder')) {
                input.val(input.attr('placeholder'));
            }
        });
    });