Span header rows

There is a possibility to merge two columns in one header as follows:
Source
<link rel="STYLESHEET" type="text/css" href="../../codebase/dhtmlxgrid.css">
<link rel="stylesheet" type="text/css" href="../../codebase/skins/dhtmlxgrid_dhx_skyblue.css">
<script  src="../../codebase/dhtmlxcommon.js"></script>
<script  src="../../codebase/dhtmlxgrid.js"></script>
<script  src="../../codebase/dhtmlxgridcell.js"></script>
 
    
<div id="gridbox" style="width:600px; height:270px; background-color:white;"></div>
<script>mygrid = new dhtmlXGridObject('gridbox');
mygrid.setImagePath("../../codebase/imgs/");
mygrid.setHeader("Sales,Book Title and Author,#cspan,Price,In Store,Shipping,Bestseller and Date of Publication,#cspan");
mygrid.setInitWidths("50,150,120,80,80,80,80,200");
mygrid.setColAlign("right,left,left,right,center,left,center,center");
mygrid.setColTypes("dyn,ed,ed,price,ch,co,ra,ro");
mygrid.getCombo(5).put(2, 2);
mygrid.setColSorting("int,str,str,int,str,str,str,str");
mygrid.enableMultiselect(true);
mygrid.setColumnMinWidth(50, 0);
mygrid.init();
mygrid.setSkin("dhx_skyblue");
mygrid.loadXML("../common/grid.xml");</script>