document.getElementById("desc").innerHTML=txt;<img src ="/upload/love/html.gif" width ="145" height ="126" alt="Planets" usemap="#planetmap" />
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onmouseover="writeText('The Sun and the gas giant planets like Jupiter are by far the largest objects in our Solar System.')"href ="sun.htm" target ="_blank" alt="Sun" />
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onmouseover="writeText('The planet Mercury is very difficult to study from the Earth because it is always so close to the Sun.')"href ="mercur.htm" target ="_blank" alt="Mercury" />
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onmouseover="writeText('Until the 1960s, Venus was often considered a twin sister to the Earth because Venus is the nearest planet to us, and because the two planets seem to share many characteristics.')"href ="venus.htm" target ="_blank" alt="Venus" />
<p id="desc">Mouse over the sun and the planets and see the different descriptions.</p>