X-Cart forums - button.tpl code...what is this stuff?

In the file button.tpl, Xcart version 3.5.2 can be found the following code:

Code:

{* MAKE SURE YOU HAVE NO REDUNDANT CARRIAGE RETURNS IN THIS FILE ! *}{if $type eq "input"}{assign var="img_type" value="INPUT type=image"}{else}{assign var="img_type" value="img"}{/if}{capture name=goimage}{include file="buttons/go_image.tpl"}{/capture}{if $style eq "button" and $webmaster_mode ne "editor"}<SCRIPT>

if (navigator.appName.indexOf('Microsoft')>=0)

document.write('<nobr><{$img_type} src="{$ImagesDir}/but1.gif" border="0" align="absmiddle"><FONT class="Button">{$button_title}</FONT>[img]{$ImagesDir}/but2.gif[/img]</nobr>');

else

document.write('<font class="FormButton">{$button_title} <{$img_type} {$smarty.capture.goimage|replace:"\r":""|replace:"\n":""}></font>' );

</SCRIPT>{else}<font class="FormButton">{$button_title} <{$img_type} {include file="buttons/go_image.tpl"}></font>{/if}

My question is, what does all of this do? I thought it created special buttons for Microsoft based browsers, but I have noticed no difference from Mozilla vs IE.

I have found a number of templates reference this file for their buttons. I have been steadily replacing the words + 'go' button across our site with a single graphical button. Is anything going to go haywire if I simply reference another template containing the image information for the button instead of using the above code from button.tpl? :?:

Thanks!