var out_header = '<img src="images/interior_header.jpg" width="1720" height="168" border="0" usemap="#header_Map">' + 
                 '<map name="header_Map">                                                                         ' + 
                 '<area shape="rect" alt="" coords="730,0,970,168" href="index.html">                             ' + 
                 '</map>';

document.write(out_header);