Unusual DHTML Coding

Below is some of the interesting DHTML coding from potlatchpaper.com a website which combines DHTML with Flash animation. In this page, which is from their main home page, a mouseover script has been applied to some buttons which, when activated, provide detailed information about types of paper over a central paper page image. 

<TABLE border="0" cellspacing=0 cellpadding=0>
    <TR>
                <TD align=center> <A href="mccoy_supernav.htm"
 target="_top" onMouseOver="changeImg(document.mccoy,'on',1)
;changeImg(document.sheet,'on',8)" onMouseOut="changeImg
(document.mccoy,'off',1)"><IMG src="../img/submenu_mcoy_lrg_off.gif" 
alt="With the character and eye-popping brilliance of a premium sheet, 
Potlatch McCoy is redefining the paper grading system." width="93"
 height="36" border="0" name="mccoy"></A><BR>

                    <A href="mccoymatte_supernav.htm" target="_top"  
onMouseOver="changeImg(document.karma,'on',2)
;changeImg(document.sheet,'on',9)" onMouseOut="changeImg
(document.karma,'off',2)"><MG src="../img/submenu_mcmatt_lrg_off.gif" alt=
"McCoy Matte's Bright White shade elicits every nuance of color and detail 
from halftone reproductions." width="130" height="36" vspace="30"
 border="0" name="karma"></A><BR>

                  <A href="vintage_supernav.htm" target="_top"  
onMouseOver="changeImg(document.vintage,'on',3);changeImg
(document.sheet,'on',10)" onMouseOut="changeImg(document.
vintage,'off',3)"><IMG src="../img/submenu_vint_lrg_off.gif" alt="Unbeatable
 for versatility, Potlatch Vintage is now a cleaner, brighter, white and the
 entire line is recycled." width="93" height="36" border="0" name=
"vintage"></A>
                </TD>
	<TD width="300" valign="middle" nowrap>
      <CENTER>
      <MG src="../img/paper_sheet.jpg" width="145" height="206" name="sheet" border="0">
      </CENTER>
      </TD>
    </TR>
  </TABLE>

A second interesting page, found at webresource.com creates a button on the page so as to begin a transition and remove an image. The crucial bit of coding is:

  <form name="revealf">
                  <INPUT TYPE="button" name="revealb" VALUE="OK, show it to me!" onClick="unhide()">
  </form>
<input type="button" onClick="go();" value="Go!">