like so?
Code:
<body>
<form>
<select id="toolList">
<option value="" style="display:none;"></option>
<option value="cDrill">Cordless Drill</option>
<option value="cScrew">Cordless Screwdriver</option>
<option value="circSaw">Circular Saw</option>
<option value="bandsaw">Bandsaw </option>
<option value="discsander">Disc Sander</option>
</select></p>
<p><select name = "buyList" multiple = "multiple" size = "10" style = "width: 500px">
<option value = "none">Items to be purchased</option>
</select></p>
<p><input type = "button" value = "Add Tool" onclick = "addTool();" style = "width: 120px" />
</form>
</body>
<script>
var toolArray = [];
var count = 0;
function addTool() {
if (document.getElementById('toolList').value == "")
window.alert("You must choose at least one item to purchase.");
else {
var dd1 = document.getElementById('toolList');
toolArray.push(dd1.options[dd1.selectedIndex].text);
document.forms[0].buyList.options[count]=new Option(toolArray[count], toolArray[count++]);
}
}
</script>