How do you automatically set text box to Uppercase?

You’ve put the style attribute on the <img> tag, instead of the <input>.

It is also not a good idea to have the spaces between the attribute name and the value…

<input type="text" class="normal" 
       name="Name" size="20" maxlength="20" 
       style="text-transform:uppercase" /> 
<img src="../images/tickmark.gif" border="0" />

Please note this transformation is purely visual, and does not change the text that is sent in POST.

NOTE: If you want to set the actual input value to uppercase and ensure that the text submitted by the form is in uppercase, you can use the following code:

<input oninput="this.value = this.value.toUpperCase()" />