Habe folgende Lösung im Internet gefunden:
<script language="JavaScript">
<!--
function WM_preloadImages() {
/*
WM_preloadImages()
Loads images into the browser's cache for later use.
Source: Webmonkey Code Library
(http://www.hotwired.com/webmonkey/javascript/code_library/)
Author: Nadav Savio
Author Email: nadav@wired.com
Usage: WM_preloadImages('image 1 URL', 'image 2 URL', 'image 3 URL', ...);
*/
// Don't bother if there's no document.images
if (document.images) {
if (typeof document.WM == 'undefined'){
document.WM = new Object();
}
document.WM.loadedImages = new Array();
// Loop through all the arguments.
var argLength = WM_preloadImages.arguments.length;
for(arg=0;arg<argLength;arg++) {
// For each arg, create a new image.
document.WM.loadedImages[arg] = new Image();
// Then set the source of that image to the current argument.
document.WM.loadedImages[arg].src = WM_preloadImages.arguments[arg];
}
}
}
// -->
</script>