You can use CSS3 column-count property for this. Write like this below:
div{
-moz-column-count: 2;
-moz-column-gap: 10px;
-webkit-column-count: 2;
-webkit-column-gap: 10px;
column-count: 2;
column-gap: 10px;
}
Read this for more http://www.quirksmode.org/css/multicolumn.html