<script>
function function1() {
var col = document.all.colors.size;
alert(col+" number of options")
}
</script>
<form method="post" action="">
<select id="colors" size="10">
<option value="white" selected>White</option>
<option value="cyan">Cyan</option>
<option value="ivory">Ivory</option>
<option value="blue">Blue</option>
<option value="red">Red</option>
<option value="lightblue">Lightblue</option>
<option value="beige">Beige</option>
</select>
<input type="button" value="Number of options" onclick="function1();">
</form>
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