function ricercanova(myselect){
	switch (myselect.selectedIndex)
	{
    	case 0: case 1: 
    		myselect.form.action='http://www.novaonline.ilsole24ore.com/ricerca.php';
    		myselect.form.blog.disabled=true;
    		break;
    	case 2: 
    		myselect.form.action='http://www.nova100.ilsole24ore.com/search/';
    		myselect.form.blog.disabled=true;
    		break;
    	case 3: 
    		myselect.form.action='http://www.nova100.ilsole24ore.com/search/';
    		myselect.form.blog.disabled=false;
    		myselect.form.blog.value="Nova24 Ora!";
    		break;
	}
}