<script language="javascript">
function changeBox() 
{
  document.getElementById('div1').style.display='none';
  document.getElementById('div2').style.display='';
  document.getElementById('password').focus();
}
function restoreBox() 
{
	if(document.getElementById('password').value=='')
	{
	  document.getElementById('div1').style.display='';
	  document.getElementById('div2').style.display='none';
	}
}
</script>
<div id="div1"><input name="pass_temp" type="text" value="Пароль" size="20" maxlength="20" onfocus="changeBox()" />
</div>
<div id="div2" style="display:none"><input name="password" id="password" type="password" value="" size="20" maxlength="20" onBlur="restoreBox()" />
</div>