jQuery点击输入框显示验证码图片

/***********************下是验证码对象*****************/var Validation = {};Validation.init = function(eleName,imageSrc){  this.image = imageSrc;  $('#'+eleName).focusin(function(){    Validation.show(eleName);  });}Validation.image = '';Validation.display=false;Validation.width = '100px';Validation.height = '30px';Validation.div = null;Validation.show = function(eleName){  if(this.display==false){    //首次显示    if(this.div==null){      $('#'+eleName).after('<div style="display:none;" id="div_validation_'+eleName+'" title="点击更换"></div>');      this.div = $('#div_validation_'+eleName);      this.div.css('position','absolute');      this.div.css('cursor','pointer');      this.div.css('border','1px solid #CCC');      this.div.css('background-color','#FFF');      this.div.css('background-position','center');      this.div.css('background-repeat','no-repeat');      this.div.css('height',this.height);      this.div.css('width',this.width);      var objOffset = $('#'+eleName).offset();      objOffset.top+=$('#'+eleName).height()+6;      this.div.offset(objOffset);      this.div.css('background-image','url('+Validation.image+'&_t='+new Date()+')');      this.div.css('display','inline-block');      this.display = true;      //点击更换      this.div.click(function(){        Validation.div.css('background-image','url('+Validation.image+'&_t='+new Date()+')');      });    }    else{      this.div.css('background-image','url('+Validation.image+'&_t='+new Date()+')');      this.display = true;      this.div.css('display','inline-block');    }  }}Validation.hide =function(){  if(this.display==true){    this.display = false;    this.div.hide();  }}

//验证码对象初始化Validation.init('validation','Ajax.ashx?handle=validation');//      输入框ID    验证图片地址 //隐藏Validation.hide();