function focus(){
    document.setfocus.here.focus();
}
function accessCSS(layerID){
	if(document.getElementById){
		return document.getElementById(layerID).style;
	}else if(document.all){
		return document.all[layerID].style;
	}else if(document.layers){
		return document.layers[layerID];
	}
}
function showhide(layerID){
	if(accessCSS(layerID).visibility=="hidden" || accessCSS(layerID).visibility=="hide"){
		accessCSS(layerID).visibility="visible";
	}else{
		accessCSS(layerID).visibility="hidden";
	}
}
if (document.images){
	starton= new Image(80,23);
	starton.src="images/nav_hover_start.gif";   
	unteron= new Image(115,23);
	unteron.src="images/nav_hover_unter.gif";  
	impon= new Image(106,23);
	impon.src="images/nav_hover_imp.gif"; 
	konon= new Image(83,23);
	konon.src="images/nav_hover_kon.gif";
	taeton= new Image(80,21);
	taeton.src="images/nav_hover_taet.gif";
	netzon= new Image(115,21);
	netzon.src="images/nav_hover_netz.gif";
	webon= new Image(106,21);
	webon.src="images/nav_hover_web.gif";
	newson= new Image(83,21);
	newson.src="images/nav_hover_news.gif"; 
	
	startoff= new Image(80,23);
	startoff.src="images/nav_start.gif";
	unteroff= new Image(115,23);
	unteroff.src="images/nav_unter.gif";
	impoff= new Image(106,23);
	impoff.src="images/nav_imp.gif";
	konoff= new Image(83,23);
	konoff.src="images/nav_kon.gif";
	taetoff= new Image(80,21);
	taetoff.src="images/nav_taet.gif";
	netzoff= new Image(115,21);
	netzoff.src="images/nav_netz.gif";
	weboff= new Image(106,21);
	weboff.src="images/nav_web.gif";
	newsoff= new Image(83,21);
	newsoff.src="images/nav_news.gif";
}
function lightup(imgName){
	if (document.images){
		imgOn=eval(imgName + "on.src");
		document[imgName].src= imgOn;
	}
}
function turnoff(imgName) {
	if (document.images){
		imgOff=eval(imgName + "off.src");
		document[imgName].src= imgOff;
	}
}

function winpop(winlink, winwidth, winheight)
{
	 var optWin = "width="+winwidth+",height="+winheight+",resizable=no,menubar=no,toolbar=no,directories=no,location=no,scrollbar=no,status=no";
	 var imgWin= window.open(winlink,"Netzwerktechnik",optWin);
	 if(!imgWin) {return true;}	 
}