HTML input field hint

I think for your situation, the easy and simple for your html input , you can probably add the attribute title

<input name="Username" value="Enter username.." type="text" size="20" maxlength="20" title="enter username">

You'd need attach an onFocus event to the input field via Javascript:

<input type="text" onfocus="this.value=''" value="..." ... />

the best way to give a hint is placeholder like this:

<input.... placeholder="hint".../>

With a bit of JavaScript:

<input 
  value="Enter username..." 
  onfocus="if (this.value === 'Enter username...') this.value=''" ... />

HTML5 has a nice attribute for this, called placeholder:

<input placeholder="Enter username.." ... />

but this attribute is not supported in old browsers.

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