CMS GRID 2 columns fixed 2 columns fluid

[potilan]

hello i hope someone can help me with this CMS grid
i need 1 left column fixed 160px, 1 right column fixed 160px and 2 columns fluid in the middle,

in the following code i have 1left column fixed, 1 fluid and 1 right column fixed
its the closest thing i found, if someone can make the modification I will be thankful

sorry for my english!

<div id="doc3">
<div id="DefaultWrapper">
<div id="DefaultMainCol">
<div class="leftcol yui-sidebar" style="width:160px; float:left;">
<ul class="list_no_decoration" id="widgetlist_column1">$column[1]</ul>
</div>
<div class="rightcol yui-sidebar" style="width:160px; float:right;">
<ul class="list_no_decoration" id="widgetlist_column3">$column[3]</ul>
</div>
<div class="centercol yui-panel" style="padding:0 10px 10px 10px; align:right; overflow:hidden;">
<ul class="list_no_decoration" id="widgetlist_column2">$column[2]</ul>
</div>
</div>
</div>
</div>

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anyone please