<select id=a multiple>
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
<option>6</option>
<option>7</option>
</select><SCRIPT LANGUAGE="JavaScript">
<!--
for(var i = 0; i < a.options.length; i++){
a.options[i].selected = true;
}
//-->
</SCRIPT>
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
<option>6</option>
<option>7</option>
</select><SCRIPT LANGUAGE="JavaScript">
<!--
for(var i = 0; i < a.options.length; i++){
a.options[i].selected = true;
}
//-->
</SCRIPT>
<!--
function SelectAll(){
var s = document.all.s
for(var i=0;i<s.length;i++){
s.options[i].selected = true;
}
}
//-->
</SCRIPT>
<SELECT id="s" multiple >
<option>1</option>
<option>2</option>
</SELECT>
<INPUT TYPE="button" value="test" onclick="SelectAll()">