function clickNav(ebene){
	eval('idStr=document.navForm.navselect_'+ebene+'.value;');
	if(idStr=="null")
	{
		if(ebene==1)
		{
			if(currentIdStr=="")
				document.navForm.navselect_1.selectedIndex=0;
			else
			{
				extract=parseInt(currentIdStr.substr(0,2));
				//alert(currentIdStr+" -> "+extract);
				document.navForm.navselect_1.selectedIndex=extract+1;
			}
		}
		else if (ebene==2)
		{
			if(currentIdStr.length==2)
				document.navForm.navselect_2.selectedIndex=0;
			else if(currentIdStr.length==4)
			{
				extract=parseInt(currentIdStr.substr(2,2));
				document.navForm.navselect_2.selectedIndex=extract+1;
			}
		}
		else if (ebene==3)
		{
			if(currentIdStr.length==4)
				document.navForm.navselect_3.selectedIndex=0;
			else if(currentIdStr.length==6)
			{
				extract=parseInt(currentIdStr.substr(4,2));
				document.navForm.navselect_3.selectedIndex=extract+1;
			}
		}
	}
	else if(idStr=="home")
	{
		document.location.href="index.html";	
	}
	else if (navigation[idStr]['typ']=="extern")
	{
		window.open(navigation[idStr]['url']);
	}
	else
	{
		document.location.href=navigation[idStr]['url'];
	}
	//writeNav();
}