Forum Moderators: open
Obviously substitute "something" with whatever you're using -- this could be table, td, div etc., and substitute "x" with the number from 1 - 100, to be the percentage of the window (or object) that this page element is in.
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Well, that's how I'm assuming you want to do it (the easy way), but the correct way is to use CSS (preferably an externally linked stylesheet) like this:
something {width: x%;}
Maybe you'd be better off hiring a designer? - This isn't like a snippet of JS you can cut and paste, you're asking to broad a question and you'll probably find that generous as people are here, not many have the time to write the several dozen pages neccessary to explain liquid design starting from <html>.....
Try www.w3schools.com - That's a good bet for learning basic HTML concepts then try This Google Search [google.com] for the specific theories and techniques.
Good luck...
Nick
There is loads of discussions here on the design and pros and cons of liquid page design
do a search of 'Liquid' in the site search here [webmasterworld.com]
It is a massive area of study and there are so many page elements involved but i would start by playing with the % widths of tables
eg:
<table width="95%">
<tr>
<td>content here</td>
</tr>
</table>
ta
Limbo