For this, you can use the column-count
property:
div#multicolumn1 {
-moz-column-count: 2;
-moz-column-gap: 50%;
-webkit-column-count: 2;
-webkit-column-gap: 50%;
column-count: 3;
column-gap: 50%;
}
Check this jsFiddle.
Note: It does not work in IE.
For IE, you can use this JavaScript: CSS3 – Multi Column Layout Demonstration