function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	} else {
		window.onload = function() {
			oldonload();
			func();
		}
	}
}

function initScrollButtons() {
	var scrollPanes = new Array('tt-news-list', 'tt-news-single', 'about', 'tx-zmlinklist', 'shop');

	for (i in scrollPanes) {
		var el = document.getElementById(scrollPanes[i] + '-scrollpane');
		if (el) {
			var height = el.scrollHeight;
			var wrapperHeight = el.parentNode.offsetHeight;
			if (height > wrapperHeight) {
				el.parentNode.style.overflow = 'hidden';
				document.getElementById(scrollPanes[i] + '-scrollbuttons').style.visibility = 'visible';
			}
		}
	}
}

addLoadEvent(initGallery);
addLoadEvent(initScrollButtons);