function _resize() {
	element = $('background');
	isoHeight = document.documentElement.clientHeight;
	isoWidth = document.documentElement.clientWidth;
	isoRatio = isoWidth/isoHeight;
	if(isoRatio<=1.49){
		element.setStyle('width', isoHeight*1.49);
		element.setStyle('height', isoHeight);
	}else{
		element.setStyle('width', isoWidth);
		element.setStyle('height', isoWidth/1.49);
	}
}

function init () {
	_resize();
}

function resize() {
	// UNCOMMENTED CONDITION
	// When active, resizing does not work in Internet Explorer 7/8
	/*
	if (Width != window.getWidth() || Height != window.getHeight()) {
	_resize();
	}
	*/
	
	_resize();
}

/* Überwachung von Netscape initialisieren */
if (!window.Width && window.innerWidth) {
  window.onresize = resize;
  Width = window.getWidth();
  Height = window.getHeight();
}

window.addEvent('domready', function() {

	element = $('background');
	var random = $random(0, 6);
	element.src = 'fileadmin/img/bg/wenckeschmid-' + random + '.jpg';
	element.style.display = 'block';	
	
	Width = window.getWidth() ;
	Height = window.getHeight() ;
	init();
});

window.addEvent('resize',function(e){
	Width = window.getWidth() ;
	Height = window.getHeight() ;
	resize();
});