How to deselect all the selection in a select ( combo ) box?

In a HTML page sometimes we may have to deslect all the selection in a select control of html. but as a user we can't do anything. But using Javascript programatically we can achieve this. Here is the sample code in Javascript.


function clearSelect( selectObj ){
for (var i = 0; i < selectObj .options.length; i++) {
selectObj .options[i].selected = false;
}
}

note: we need to pass the select object as a parameter to this function.

the alternative to this code is
function clearSelect( selectObj ){
selectObj.selectedIndex = -1;
}