how to partition the html page for certain length.. before and after the partitioning page should be only one column??

Question

I'm designing a webpage where the webpage has 3 column explanation after that it's a one column heading.. so I'm not able to divide it..

Answer 1

Heres the html for this sort of thing

<div class="top"> top content goes here </div>
<div class="content-wrap">
<div class="columns">column 1</div>
<div class="columns">column 2</div>
<div class="columns">column 3</div>
</div>
<div class="bottom">Bottom content goes here</div>

Then here comes the css to style it

.top, .bottom {clear:both;}
.content-wrap {clear:both;}
.columns {width:30%;float:left;}

This should work for you. You can then add other css properties to style your design.