CSS keeping the footer at the bottom

Spent enough time trying different methods across the web but only 1 article worked for me using the "push" div layer. Loosely based on Ryanfait: Make a Footer Stick to the Bottom of the Page

Aim:
Header

Left


Right

Footer
copyraw
<div id="container">
     <div id="header"></div>
     <div id="content">
          <div id="left"></div>
          <div id="right"></div>
          <div class="push"></div>
     </div>
     <div id="footer"></div>
</div>
  1.  <div id="container"> 
  2.       <div id="header"></div> 
  3.       <div id="content"> 
  4.            <div id="left"></div> 
  5.            <div id="right"></div> 
  6.            <div class="push"></div> 
  7.       </div> 
  8.       <div id="footer"></div> 
  9.  </div> 
Situation
The header displayed fine. The left and right columns finally got them side by side. But the footer that has a background image was under the left and right columns... The main content layer was overlapping the footer. I tried various z-index's bearing in mind that the footer has to be behind because the main content had a semi-transparent layer that overlapped it half-way.

I managed to fix this by including a div push layer which clears both (even though i had clear:both on the css for my #right div layer). For some reason, it has a more forceful effect in its own separate layer.

In a joomla CMS template though, I wanted the "left" div to take over the whole page if there were no modules positioned in the "right" div. I specified width of left using PHP. This is the CSS though:
copyraw
#container {
	position: relative;
}
#content {
	position: relative;
	top: 0;
	width: 900px; 
	margin: 0 auto;
	min-height: 500px; /* to stop footer coming up on empty pages */
	background-image: url("../images/bg_contentbox.png"); /* semi transparent background */
}
#footer {
	position: relative;
	bottom:0;
	margin:0;
	padding:0;
	width:100%;
	height: 250px; /* height of my footer */
	background-color: #8cc553;
	z-index: -1;
}
#left {
	float: left;
        width:500px;
	margin: 0;
	padding: 0;
}
.push {
	clear:both;
}
#right {
	float:left;
	width:380px;
	margin: 0 0 0 20px;
	padding: 0;
}
  1.  #container { 
  2.      position: relative; 
  3.  } 
  4.  #content { 
  5.      position: relative; 
  6.      top: 0
  7.      width: 900px
  8.      margin: 0 auto; 
  9.      min-height: 500px; /* to stop footer coming up on empty pages */ 
  10.      background-image: url("../images/bg_contentbox.png"); /* semi transparent background */ 
  11.  } 
  12.  #footer { 
  13.      position: relative; 
  14.      bottom:0
  15.      margin:0
  16.      padding:0
  17.      width:100%; 
  18.      height: 250px; /* height of my footer */ 
  19.      background-color: #8cc553; 
  20.      z-index: -1
  21.  } 
  22.  #left { 
  23.      float: left; 
  24.          width:500px
  25.      margin: 0
  26.      padding: 0
  27.  } 
  28.  .push { 
  29.      clear:both; 
  30.  } 
  31.  #right { 
  32.      float:left; 
  33.      width:380px
  34.      margin: 0 0 0 20px
  35.      padding: 0
  36.  } 
Category: Cascading Stylesheets :: Article: 350

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