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For built-in validators in general you can customize error messages by setting the <a href="http://www.yiiframework.com/doc/api/1.1/CValidator#message-detail" rel="nofollow"><code>message</code></a> property of the validation when defining the rule within your model's <code>rules()</code>. Some built-in validators have additional specific error messages that you can set, for example <a href="http://www.yiiframework.com/doc/api/1.1/CNumberValidator" rel="nofollow"><code>CNumberValidator</code></a> also has the properties <a href="http://www.yiiframework.com/doc/api/1.1/CNumberValidator#tooSmall-detail" rel="nofollow"><code>tooSmall</code></a> and <a href="http://www.yiiframework.com/doc/api/1.1/CNumberValidator#tooBig-detail" rel="nofollow"><code>tooBig</code></a>. For validators with additional error messages, these are mentioned prominently in the validator's reference documentation. When using custom validation rules you specify the error message explicitly using <a href="http://www.yiiframework.com/doc/api/1.1/CModel#addError-detail" rel="nofollow"><code>CModel::addError</code></a> or <a href="http://www.yiiframework.com/doc/api/1.1/CValidator#addError-detail" rel="nofollow"><code>CValidator::addError</code></a>, so again you have full control over it. When displaying input forms you can customize the CSS class of various elements by using the properties <a href="http://www.yiiframework.com/doc/api/1.1/CHtml#errorCss-detail" rel="nofollow"><code>CHtml::errorCss</code></a> (CSS class for an input element that has an error), <a href="http://www.yiiframework.com/doc/api/1.1/CHtml#errorMessageCss-detail" rel="nofollow"><code>CHtml::errorMessageCss</code></a> (class for the error message that displays next to the input element) and <a href="http://www.yiiframework.com/doc/api/1.1/CHtml#errorSummaryCss-detail" rel="nofollow"><code>CHtml::errorSummaryCss</code></a> (class for the error summary that usually appears on top of the form if you choose to print it). Since Yii 1.1.13 you can also customize <a href="http://www.yiiframework.com/doc/api/1.1/CHtml#errorContainerTag-detail" rel="nofollow"><code>CHtml::errorContainerTag</code></a> to select the tag name for each validation error message (this tag will get the <code>errorMessageCss</code> class).
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