How to add and remove OPTION Elements for HTML SELECTs

This might be something you´ve read 1000 times in other blogs, but I am doing it for the third time in two weeks, so I am going to write it down. This is how you remove all OPTION elements from an HTML SELECT Element (Liferay version):

var element= document.getElementById("<portlet:namespace />theId");

And this is how you add a selected OPTION Element:

var option= document.createElement("OPTION");
option.text = 'Your text';
option.value = 'Your value';
option.selected = true; 

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If you have any questions, feel free to leave a comment.