var objImg = new Image();
// Falls es sich um einen IE handelt
if(/MSIE/.test(navigator.userAgent) && !window.opera && (Number(navigator.userAgent.split(";")[1].substr(navigator.userAgent.split(";")[1].search(/\d/))) < 7)){
	objImg.src = "ziffenblatt50.gif";
}else{
	objImg.src = "ziffenblatt50.png";
}
<br />
<b>Warning</b>:  main(Date.php) [<a href='function.main'>function.main</a>]: failed to open stream: No such file or directory in <b>/var/www/vhosts/wdcdance.com/httpdocs/jscripts/uhr.js.php</b> on line <b>12</b><br />
<br />
<b>Fatal error</b>:  main() [<a href='function.require'>function.require</a>]: Failed opening required 'Date.php' (include_path='.') in <b>/var/www/vhosts/wdcdance.com/httpdocs/jscripts/uhr.js.php</b> on line <b>12</b><br />