The focus() method gives the focus to the select box.
<html>
<head>
<script language="JavaScript">
<!--
function setFocus(num){
if(num == 1){
document.myForm.mySelect1.focus();
}else if(num == 2){
document.myForm.mySelect2.focus();
}
}
-->
</script>
</head>
<body>
<P>
<form name="myForm">
<select name="mySelect1" multiple>
<option value=A>AA</option>
<option value=B>BB</option>
<option value=C>CC</option>
<option value=D>DD</option>
</select>
<input type=BUTTON value="Click to Set Cursor" name="myButton1"
onClick="setFocus(1)">
<br>
<select name="mySelect2" multiple>
<option value=E>EE</option>
<option value=F>FF</option>
<option value=G>GG</option>
<option value=H>HH</option>
</select>
<input type=BUTTON value="Click to Set Cursor" name="myButton2"
onClick="setFocus(2)">
</form>
</body>
</html>