[Lynne]

I did no styling, just a quick throw together and have only looked at it on firefox and Safari:

<style type="text/css">
#gridl3_container {
    position: relative;
    clear: both;
    float: left;
    width: 100%;
    overflow: hidden;
}
#gridl3_full {
    position: relative;
    overflow: hidden;
}
#gridl3_midmask {
    float: left;
    width: 70%;
    position: relative;
}
#gridl3_rightcol {
    float: right;
    width: 30%;
    position: relative;
}

#gridl3_leftcol {
    float: left;
    width: 200px; /*controls width of left column*/
    position: relative;
    overflow: hidden;
}

</style>

<div id="gridl3_container">
            <div id="gridl3_leftcol">
                <ul class="list_no_decoration" id="widgetlist_column1">$column[1]</ul>
            </div>
            <div id="gridl3_full">
                <div id="gridl3_midmask">
                    <ul class="list_no_decoration" id="widgetlist_column2">$column[2]</ul>
                </div>
                <div id="gridl3_rightcol">
                    <ul class="list_no_decoration" id="widgetlist_column3">$column[3]</ul>
                </div>
            </div>
</div>