XHTML+CSS(<div>-container nebeneinander + zentriert)

schönen guten abend,

ich hab hier ein problem was mich schon seit einer woche beschäftigt:

ich möchte 2 div container nebeneinander platzieren und alles zentrieren

so schauts in der html file aus:

<div ID="top">
<img ALT="" SRC="images\background\top.jpg" ID="background_top">
<img ALT="" SRC="images\background\middle.jpg" ID="background_middle">
<img ALT="" SRC="images\background\bottom.jpg" ID="background_bottom">
</div>
<div ID="bottom" ALIGN="center">
<div ID="navigation">
<img ALT="" SRC="images\navigation\top.jpg" ID="navigation_top">
<img ALT="" SRC="images\navigation\middle.jpg" ID="navigation_middle">
<img ALT="" SRC="images\navigation\bottom.jpg" ID="navigation_bottom">
</div>
<div ID="mainframe">
<img ALT="" SRC="images\mainframe\top.jpg" ID="mainframe_top">
<img ALT="" SRC="images\mainframe\middle.jpg" ID="mainframe_middle">
<img ALT="" SRC="images\mainframe\bottom.jpg" ID="mainframe_bottom">
</div>
</div>

und so in der css datei...

body
{
line-height:19px;
}
#top
{
position:static;
z-index:1;
}
#bottom
{
width:772
z-index:2;
}
#navigation
{
float:left;
width:200
text-align:left;
z-index:2;
}
#mainframe
{
float:right;
width:558;
text-align:left;
z-index:auto;
}
#background_top
{
position:static;
top:0px;
height:121px;
width:772px;
z-index:auto;
}
#background_middle
{
position:relative;
top:-4px;
height:480px;
width:772px;
z-index:auto;
}
#background_bottom
{
position:relative;
top:-13px;
height:10px;
width:772px;
z-index:auto;
}
#navigation_top
{
position:static;
top:0px;
height:13px;
width:200px;
z-index:auto;
}
#navigation_middle
{
position:relative;
top:-4px;
height:300px;
width:200px;
z-index:auto;
}
#navigation_bottom
{
position:relative;
top:-10px;
height:13px;
width:200px;
z-index:auto;
}
#mainframe_top
{
position:static;
top:0px;
height:13px;
width:400px;
z-index:auto;
}
#mainframe_middle
{
position:relative;
top:-4px;
height:300px;
width:400px;
z-index:auto;
}
#mainframe_bottom
{
position:relative;
top:-10px;
height:13px;
width:400px;
z-index:auto;
}

Sry für dieses FLOODING...

hoffe mir kann jemand helfen...
danke im vorraus!

huhu....

yeeaah es klappt^^

thx@ Jörg