var ispaused = 0;
 var curr_frame = 0;
 var st_fr = 0;
 var en_fr = 0;
         

    
    function start_slideshow(start_frame, end_frame, delay) {
        st_fr = start_frame;
        en_fr = end_frame;
        curr_frame=start_frame;
        setTimeout(switch_slides(start_frame, delay), delay);
    }
                            
    function switch_slides(frame, delay) {
        return (function() {
            if(ispaused == 0){
                Effect.Fade('slideshow' + curr_frame);
                if (frame == en_fr) { frame = st_fr;} else { frame = frame + 1;}
                curr_frame=frame;
                setTimeout("Effect.Appear('slideshow" + frame + "');", 1000);
            }
            setTimeout(switch_slides(frame, delay), delay + 450);
        })
    }
    
    function DoPause(){
    if(ispaused==0){
        ispaused = 1;
        document.getElementById('control2').innerHTML='<img src="/sitegraphics/comstock-playbutton01.gif" />';
        }
     else if(ispaused==1){
        ispaused = 0;
        document.getElementById('control2').innerHTML='<img src="/sitegraphics/comstock-pausebutton01.gif" />';
        }
     document.getElementById('control2').blur();
    }
    
    function DoPrev(){
    if(ispaused==0) {DoPause();}
                Effect.Fade('slideshow' + curr_frame);
                if (curr_frame == st_fr) { curr_frame = en_fr;} else { curr_frame = curr_frame - 1;}
                setTimeout("Effect.Appear('slideshow" + curr_frame + "');", 1000);
    document.getElementById('control1').blur();
    }

    function DoNext(){
    if(ispaused==0) {DoPause();}
                Effect.Fade('slideshow' + curr_frame);
                if (curr_frame == en_fr) { curr_frame = st_fr;} else { curr_frame = curr_frame + 1;}
                setTimeout("Effect.Appear('slideshow" + curr_frame + "');", 1000);
    document.getElementById('control3').blur();
    }