function openWindow( targetURL, winName, winWidth, winHeight )
{
    if ( targetURL == "" )
    {
        alert( "kein Ziel" );
        return false;
    }
    if ( targetURL == "" )
    {
        alert( "kein Fenstername" );
        return false;
    }
    if ( ( ! winWidth ) || ( winWidth == "" ) )
        winWidth = "600";
    if ( ( ! winHeight ) || ( winHeight == "" ) )
        winHeight = "200";

    if ( ! eval("window." + winName) || eval( winName + ".closed") )
	{
		window[winName] = window.open(targetURL,winName,"width=" + winWidth + ",height=" + winHeight + ",top=0,left=0,screenY=0,screenX=0,scrollbars=yes,menubar=yes");
	}
	eval( winName + ".focus();" );
}

function closeWindow()
{
    if ( opener )
        opener.focus();
    this.close();
}