Adding error messages to nonfield inputs

Hi,

I used below logic for my same requirement:

public class Wrapper
{
public String FirstName {get; set;}
public String MiddleName {get; set;}
public String LastName {get; set;}
public String Email {get; set;}

public String FirstNameError {get; set;}
public String MiddleNameError {get; set;}
public String LastNameError {get; set;}
public String EmailError {get; set;}

public Wrapper()
{
FirstNameError='';
MiddleNameError='';
LastNameError='';
EmailError='';
}
}

Validation in save method is:-

for (Wrapper wrap : wrappers)
{
if ( ((null==wrap.FirstName) || (wrap.FirstName.trim().length()==0)) &&
((null==wrap.MiddleName) || (wrap.MiddleName.trim().length()==0)) )
{
wrap.FirstNameError='Either first name or middle name must be defined';
wrap.MiddleNameError='Either first name or middle name must be defined';
}
}

And in visualforce page:-

<apex:column headerValue="First Name">
<apex:inputText value="{!wrapper.FirstName}" rendered="{!LEN(wrapper.FirstNameError)==0}"/>
<apex:outputPanel rendered="{!LEN(wrapper.FirstNameError)!=0}">
<apex:inputText styleClass="error" value="{!wrapper.FirstName}"/>
<div class="errorMsg"><strong>Error:</strong>&nbsp;{!wrapper.FirstNameError}</div>
</apex:outputPanel>
</apex:column>

Hope this helps.

Thanks.