var iversion = -1; function version() { if (iversion != -1) return iversion; var ua = window.navigator.userAgent; if(navigator.appName.indexOf("Netscape") != -1) { var nav = ua.indexOf("Mozilla/"); if (nav != -1) iversion = parseInt ( ua.substring ( nav+8, ua.indexOf ( ".", nav+8 ) ) ); } else if(navigator.appName.indexOf("Internet Explorer") != -1) { var msie = ua.indexOf ( "MSIE " ); if ( msie > 0 ) // is Microsoft Internet Explorer; return version number iversion = parseInt ( ua.substring ( msie+5, ua.indexOf ( ".", msie ) ) ); } return iversion; } if (3 <= version()) { closeon = new Image(); closeon.src = "close1on.gif"; closeoff = new Image(); closeoff.src = "close1off.gif"; } function rollon(imgName) { if (3 <= iversion) { document[imgName].src = eval(imgName + "on.src"); } } function rolloff(imgName) { if (3 <= iversion) { document[imgName].src = eval(imgName + "off.src"); } }