Гистограмма построена с использованием свойства images[ ] объекта Document.
<html>
<head>
<script language="JavaScript">
i=0
function d_rand() {
for(j=0;j<10;j++) {
for(i=0;i<10;i++) document.images[j+i*10].src = "white.jpg"
y= Math.floor(Math.random()*10)
for(i=9;i>9-y;i--) document.images[j+i*10].src = "blue.jpg"
}
}
</script>
<body bgcolor=ffffff>
<center>
<table border=0>
<tr>
<td><img src="white.jpg" width=20 height=10></td>
<td><img src="white.jpg" width=20 height=10></td>
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<td><img src="white.jpg" width=20 height=10></td>
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<tr>
<td><img src="white.jpg" width=20 height=10></td>
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<tr>
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<td><img src="white.jpg" width=20 height=10></td>
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<tr>
<td><img src="white.jpg" width=20 height=10></td>
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<tr>
<td><img src="white.jpg" width=20 height=10></td>
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<tr><td colspan=10><img src="blue.jpg" width=250 height=2></td></tr>
</table>
<form name=diagram>
<input name=random type=button value=click onClick="d_rand()">
</form>
</center>
</body>
</html>