Using JScript in DHTML to Manipulate Objects in a SELECT tag

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The following code can be used to dynamically add, remove or select all items in a SELECT object. The code assumes that when objects are added to the SELECT object, that the display text and value are identical. 

<script language="javascript">
function addToList(txtBox, selectBox){
var oOption = document.createElement("OPTION");
oOption.text = txtBox.value;
oOption.value = txtBox.value;
selectBox.add(oOption);
txtBox.value = "";
txtBox.focus();
}

function removeFromList(selectBox){
selectBox.remove(selectBox.selectedIndex);
}

function selectEntireList(selectBox){
var fromObj = selectBox;
for ( selIndex = fromObj.length; selIndex -- ; selIndex > 0 ){
if(fromObj.options[selIndex].text != ""){
fromObj.options[selIndex].selected = true;
}
}
}
</script>