// JavaScript Document

var children = document.getElementById('box').getElementsByTagName('div');

for (var i = 0; i < children.length; i++) {

	if (children[i].className == 'box_struttura') {
        children[i].onmouseover = function() {
            this.style.backgroundColor='#F9F9F9';
        }
        children[i].onmouseout = function() {
            this.style.backgroundColor='#FFFFFF';
        }
	   
    }

}