function chgBg(obj,klasse){
  	if (document.all || document.getElementById) {
		if(document.getElementById('tr_'+obj)) document.getElementById('tr_'+obj).className = klasse;
		if(document.getElementById('td1_'+obj)) document.getElementById('td1_'+obj).className = klasse;
		if(document.getElementById('td2_'+obj)) document.getElementById('td2_'+obj).className = klasse;
		if(document.getElementById('td3_'+obj)) document.getElementById('td3_'+obj).className= klasse;
	}
}

function OeffneFenster(URL, breite, hoehe) {
	if(!breite) { breite = 600; }
	if(!hoehe) { hoehe = 450; }
	breite = breite + 16;
	hoehe = hoehe + 16;
	var oBrowser = new BrowserProps();//
	var iWidth = oBrowser.ScreenAvailWidth;
	var iHeight = oBrowser.ScreenAvailHeight;
	var iLeft = (iWidth-breite)/2;
	var iTop = (iHeight-hoehe)/2;
	if (iLeft<0) iLeft = 0;
	if (iTop<0) iTop = 0;

	var win = window.open(URL, 'grafikgross', "toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=0,width="+breite+",height="+hoehe+",screenX=" + iLeft + ",screenY=" + iTop + ",left=" + iLeft + ",top=" + iTop);
	win.focus();
}

function BrowserProps() {
	//ermitteln der maximalen Fenstergroesse
	if (navigator.userAgent.indexOf("Opera")>-1) {
		this.ScreenAvailWidth = top.window.innerWidth;
		this.ScreenAvailHeight = top.window.innerHeight;
	} else {
		this.ScreenAvailWidth = screen.availWidth;
		this.ScreenAvailHeight = screen.availHeight;
	}
}

function checkSize(showimg) {
	if(window.screen) {
		if(screen.width > 950) {
			document.getElementById('bilderliste').style.width = '180px';
			document.getElementById('bilderliste').style.padding = '5px';
			document.getElementById('bilderliste').style.visibility = 'visible';
			document.write('<table border="0" style="" width="155" cellpadding="0" cellspacing="0">');
			if(showimg) {
				document.write('<tr><td id="bilderliste_tabelle" align="center"><img src="images/36-g-h.jpg" width="140" height="125" alt="Foto 1" border="0" /><br /><br /></td></tr>');
				document.write('<tr><td align="center"><img src="images/41-g-h.jpg" width="140" height="125" alt="Foto 2" border="0" /><br /><br /></td></tr>');
				document.write('<tr><td align="center"><img src="images/30-k-h.jpg" width="140" height="125" alt="Foto 3" border="0" /></td></tr>');
			} else {
				document.write('<tr><td align="center"><img src="images/pixel_trans.gif" width="140" height="125" alt="" border="0" /></td></tr>');
			}
			document.write('</table>');
		}
	}
}