var name_browser = navigator.appName ;
	var version_browser = navigator.appVersion ;
	var t_version_browser = version_browser.substring (22,25) ;
				
	if ( (t_version_browser < 7) && (name_browser == "Microsoft Internet Explorer") )
		document.write('<link href="../style_sheet/style_img_png.css" rel="stylesheet" type="text/css"/>') ;