function display_abo_in( aboid, placeholder ) { 
    try{ 
        var p      = document.getElementById(placeholder);
        var iframe = document.createElement("iframe");
        var my_id  = 'frame_' + placeholder;
        iframe.src = 'http://www.tandem.travel//renderview.php?aboid=' + aboid + '&referer=' + location + '&fid=' + my_id;
        for( att in p.style ) {
            if( att != 'content') {
                try { 
                    iframe.style[att] = p.style[att]; 
                } catch(e) {};
            }
        }
        iframe.style.backgroundImage = '';
        iframe.style.backgroundColor = 'transparent';
        iframe.style.borderWidth = '0px';
        iframe.frameBorder = 'no';
        iframe.scrolling = 'auto';
        iframe.id = my_id;
        p.parentNode.replaceChild(iframe,p);

    } catch(e) { 
        alert('Problem bei der Anzeige des Abos in id ' + placeholder + ': ' + e.message); 
    } 
/*
    try{ 
        var allEl     = document.getElementsByClassName(placeholder);
        var i;
        for(i=0; i<allEl.length; i++) {
            var p = allEl[i];
            var iframe = document.createElement("iframe");
            var my_id  = 'frame_' + placeholder + "_no_" + i;
            iframe.src = 'http://www.tandem.travel//renderview.php?aboid=' + aboid + '&referer=' + location + '&fid=' + my_id;
            for( att in p.style ) {
                try { iframe.style[att] = p.style[att]; } catch(e) {};
            }
            iframe.style.backgroundImage = '';
            iframe.style.backgroundColor = 'transparent';
            iframe.style.borderWidth = '0px';
            iframe.frameBorder = 'no';
            iframe.scrolling = 'auto';
            iframe.id = my_id;
            p.parentNode.replaceChild(iframe,p);
        }
    } catch(e) { 
        // alert('Problem bei der Anzeige des Abos in class ' + placeholder + ': ' + e.message); 
    } 
*/
};