function preloadImages() {
	// number of titlepics
	maxId = 11;

	// lang-Buttons
	imgs = new Array();
	imgs[0] = new Image();
	imgs[0].src= '_but/englisch_hover.gif';
	
	imgs[1] = new Image();
	imgs[1].src = '_but/deutsch_hover.gif';

	imgs[2] = new Image();
	imgs[2].src = '_but/griechisch_hover.gif';

	// titlepics
	titles = new Array();
	for ( i = 0; i < maxId; ++i ) {
		for ( k = 0; k < 5; ++k ) {
			titles[i*5 + k] = new Image();
			titles[i*5 + k].src = 'http://www.philharmonia.de/_img/title' + i + '/title' + k+1 + '.jpg';
		}
	}
}	

/**
  * @param type img or style
  */
function doOnMouseover(type, obj, hover) {
	if ( obj == null )
		return;
	
	switch(type) {
		case "img":
			obj.src = hover;
			break;
			
		case "style":
			obj.className = hover;
			break;
			
		default:
			return;
			break;
	}
}

function doOnMouseout(type, obj, unhover) {
	if ( obj == null )
		return;
	
	switch(type) {
		case "img":
			obj.src = unhover;
			break;
			
		case "style":
			obj.className = unhover;
			break;
			
		default:
			return;
			break;
	}
}