Need help with validation on image links

[Bootzilla33]

I have fields on a form that have required validation. I want to have that validation when clicking on one of the links in the image. How do I do that. Here is the code for the image.

asp:Image ID="Image1" runat="server" class="image-center" src="images/CustomerSelection.png" alt="" usemap="#Map" />

Here are the fields that are being validated on button click:

  <form method="POST" action="" class="form-horizontal" id="customer-form">
	 

		<label for="exampleInputServiceAgency">Service/Agency:</label>
		  C812 - NASA
		  
			   
			
	  

	   

		<label for="exampleInputCustomerCode">Buying Activity Code:</label>
		  
		  
	  

	  

		<label for="exampleInputName">Name:</label>