Blur a element with a function

I want to blur a element of my scene when a timeline in played. I use this line of code
First i create a variable
var answerElement = hypeDocument.getElementById(‘button’);
and then i set the Blur property to 2.
hypeDocument.setElementProperty(button, ‘Blur’, value, 2.0, ‘easeinout’);
But of corse it docent work… Any help???

this property does not exist within hypes api. so use a timeline or apply a css3 filter yourself