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You can detect if the image request failed using the images onError event handler supported by browsers that support the Image object:
<img src="http:///www.somewhere.com/remoteimage.gif" onError="this.src='localimage.gif'">
You can even check for the image before displaying it so that it works the other way around:
<img src="localimage.gif" width="50" height="50"> <img src="http:///www.somewhere.com/remoteimage.gif" width="1" height="1" onLoad="document.images['otherImageName'].src=this.src">
It is also possible to do this without even displaying the image:
<script language="JavaScript"><!--
var myImage =new Image();
myImage.onerror = myError;
myImage.src = 'http:///www.somewhere.com/remoteimage.gif';
function myError() {
myImage.src = 'localimage.gif';
}
//--></script>