// do not outsource the next statements into an 
// a *.js-file (or into an onload-function)!
// you will run into trouble, because 
// browsers interpret MouseOvers before webpage
// is completly loaded and onload-handler is
// executed

var imageLanguageUrl = imageUrl + language + '/';

imagePlus              = new Image();
imagePlus.src          = imageUrl + 'plus.gif';

imageMinus              = new Image();
imageMinus.src          = imageUrl + 'minus.gif';

imageMaximizeThread			= new Image();
imageMaximizeThread.src = imageUrl + 'maximizeThread.gif';

imageMinimizeThread			= new Image();
imageMinimizeThread.src = imageUrl + 'minimizeThread.gif';