How can I clear a Select listbox that was populated dynamically?

I use the following code but it didn't work:<br>

var selectList = document.getElementById("mylist");
for (i=0;i<selectList.options.length;i++)
{
selectList.removeChild(selectList.options.item(i));
}

Please help.

Simply setting the options length to zero will delete all the items.
selectList.options.length = 0;