[SOLVED] How to make posts in Query Posts Plugin appear in 2 columns

Hi, I am using Atahualpa 3.5.1, WordPress 3.0.

The Author of the Query Posts Plugin gave me some CSS code to try to get the posts in a particular Query Posts widget to appear in two columns. But it didn't work. He suggested that if it did not work, I ask the author of Atahualpa.

Here is the CSS code he suggested that did not work:

/* Font. */
#query-posts-4 {
font-size: 14px;
}

/* Layout. */
#query-posts-4 {
overflow: hidden;
}

#query-posts-4 .widget {
clear: none;
float: left;
width: 100px; /* Adjust to your needs. */
margin: 0 10px 0 0; /* Adjust to your needs. */
}

Here are the CSS rules that he said the Atahualpa author could work with:

#query-posts-4 { }

.posts { }

.hentry { }

.entry-title { }

.byline { }

.entry-content { }

.entry-summary { }

.entry-meta { }

With the above, can anyone tell me how to get the posts in a particular Query Posts widget to appear in two columns? (My site under construction is at: www.HelpingYouCare.com/blog

Many thanks!