jQquery: Clear input on focus, restore on blur

gistfile1

var default_value = "Select by city,state or zip";

$('#searchform #s').val(default_value);

       $('#searchform #s').focus(function(){
               if(this.value == default_value) {
                       this.value = '';
               }
       });

       $('#searchform #s').blur(function(){
               if(this.value == '') {
                       this.value = default_value;
               }
       });