Aligning my page

I am trying to align my page so the div divCreateEventSearchResults takes up 50% of the right hand side while the rest of the divs stay on the left.

My jsp file is attached.

What change would I need to make to make this happen?  

I have add a screenshot of the page as it currently is and I have sent the jsp page responsible for the layout.  

Thank you for the help.  i am new to css.
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Tom BeckCommented:
This div would need a float:left and a width:50%.

<div class="marginLeft15 row">
    <div class="span6 row" style="float: left; width: 50%;">

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