Customizing HTML: Using a fixed-width table
To make all of the output fit inside a fixed-width table, edit two files: "header.htm" and "footer.htm", found in the folder "search/searchdata/templates".
In "header.htm", add the following text right after the <body> tag:
<table border="0" width="638"><tr><td align="left" valign="top">In "footer.htm", add the following text right before the </body> tag:
</td></tr></table>You may replace "638" with your desired width. To make a centered table, use the HTML <center> tag before and after the <table> tag.
Sometimes the table will be extended beyond its fixed width, if there is a long string of text that can't be broken into multiple lines (a long URL, for example). This is a limitation of the browser.
Some users have had better luck using the following pairs of tags, rather than <table>. For the header:
<center><div style="text-align:left;align:center;width:638px">Footer:
</div></center>This alternate syntax tends to render faster, though it may require newer browsers.
"Customizing HTML: Using a fixed-width table"
http://www.xav.com/scripts/search/help/1022.html