js placeholder

// JavaScript Document$(function(){    if( !('placeholder' in document.createElement('input')) ){      $('input[placeholder],textarea[placeholder]').each(function(){         var that = $(this),         text= that.attr('placeholder');         if(that.val()===""){           that.val(text).addClass('placeholder');         }         that.focus(function(){           if(that.val()===text){             that.val("").removeClass('placeholder');           }         })         .blur(function(){           if(that.val()===""){             that.val(text).addClass('placeholder');           }         })         .closest('form').submit(function(){           if(that.val() === text){             that.val('');           }         });       });     }     })