var w_wid = jQuery(window).width ();
var w_hei = jQuery(window).height ();

var cwid = 978;
	
var wid = w_wid;

wid = Math.floor ( ( wid - cwid ) / 2 );

var maxwid = 39;
maxwid = Math.min ( maxwid, wid );

document.write ( '<div id="main_image_left" style=" visibility: hidden; left: ' + (wid-maxwid+1) + 'px; width:' + (maxwid) + 'px"></div>' );
document.write ( '<div id="main_image_right" style=" visibility: hidden; left: ' + (wid+cwid) + 'px; width:' + (maxwid) + 'px"></div>' );