function open_popup( url, winwidth, winheight, wintop, winleft ) {
	if(!winwidth){
		winwidth=600;
	}
	if(!winheight){
		winheight=600;
	}
	if(!wintop){
		wintop=10;
	}
	if(!winleft){
		winleft=10;
	}

	medienfenster=window.open(url,'medienfenster','width=' + winwidth + ',height=' + winheight + ',left='+winleft+',top='+wintop+',menubar=no,toolbar=no,resizable=no,scrollbars=yes');

	if(medienfenster){
		medienfenster.focus();
	}
}

function open_window(url,winwidth,winheight,wintop,winleft){
	if(!winwidth){
		winwidth=600;
	}
	if(!winheight){
		winheight=600;
	}
	if(!wintop){
		wintop=10;
	}
	if(!winleft){
		winleft=10;
	}

	medienfenster=window.open(url,'medienfenster','width=' + winwidth + ',height=' + winheight + ',left='+winleft+',top='+wintop+',menubar=yes,toolbar=yes,resizable=yes,scrollbars=yes');

	if(medienfenster){
		medienfenster.focus();
	}
}