timeline1on = new Image(195, 74);
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        timeline1off = new Image(143, 68);
        timeline1off.src = "/images/timeline_1911_off.gif";
        
        timeline2on = new Image(195, 74);
        timeline2on.src = "/images/timeline_1927_over.gif";
        timeline2off = new Image(143, 68);
        timeline2off.src = "/images/timeline_1927_off.gif";
        
        timeline3on = new Image(195, 74);
        timeline3on.src = "/images/timeline_1937_over.gif";
        timeline3off = new Image(143, 68);
        timeline3off.src = "/images/timeline_1937_off.gif";
        
        timeline4on = new Image(195, 74);
        timeline4on.src = "/images/timeline_1947_over.gif";
        timeline4off = new Image(143, 68);
        timeline4off.src = "/images/timeline_1947_off.gif";
        
        timeline5on = new Image(195, 74);
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        timeline6on = new Image(195, 74);
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        timeline6off.src = "/images/timeline_1961_off.gif";
        
        timeline7on = new Image(195, 74);
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        timeline7off = new Image(143, 68);
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